Sony DFS-700 Switch User Manual
Contents
1. AVRCP Audio Video Remote Control Profile you can control by using the unit buttons Refer to the operating instructions supplied with the connecting device on how to operate it Note Operation of the BLUETOOTH connecting device by this unit will vary depending on its specification Status In stop or pause mode Press once and hold a HE gt PI Starts playback Stop Skip to next previous Fast forward Fast rewind Status In play mode Press once and hold gt i lea gt gt Pause Stop Skip to next previous Fast forward Fast rewind 1 You may need to press the button twice depending on the BLUETOOTH device 2 Some BLUETOOTH devices may not operate Note You cannot adjust the volume of the BLUETOOTH device by the unit volume buttons 15 16 TH Multi function button MFB POWER button Check the following before operating the unit The BLUETOOTH function is active on the mobile phone Pairing of this unit and the BLUETOOTH mobile phone is complete 1 Press and hold the POWER button for about 3 seconds while the unit is turned off The indicator blue and indicator red flash together twice the unit turns on and then this unit automatically connects to the last BLUETOOTH mobile phone that was used Note Do2. phone Refer to the manual supplied with your mobile phone on operating details When not communicating you can call using the voice dial function by pressing the multi function button You can call a specific number by pressing the multi function button for about 2 seconds To receive a call When the telephone is ringing ring tone will be heard through the unit 1 Press the multi function button on the unit The ring tone differs in the following ways depending on your mobile phone ring tone set on the unit ring tone set on the mobile phone ring tone set on the mobile phone only for BLUETOOTH connection Note If you pressed the call button on the BLUETOOTH mobile phone some BLUETOOTH mobile phones may have handset use priority In this case set to talk with the unit by pressing and holding the multi function button for about 2 seconds or by operating the BLUETOOTH mobile phone For details refer to the manual supplied with your BLUETOOTH mobile phone To adjust the volume Push the jog switch up or down to adjust the volume Tips You cannot adjust the volume when not communicating Volume level for calling and listening to music can be set independently To terminate a call You can end a call by pressing the multi function button on the unit To stop use 1 Terminate BLUETOOTH connection by the BLUETOOTH mobile phone 2 Press and hold the POWER button for about 3 seconds
3. Make the BLUETOOTH connection A2DP from a BLUETOOTH device to this unit Refer to the operating instructions supplied with the BLUETOOTH device on how to operate it 3 Start playback on the BLUETOOTH device Tip BLUETOOTH connection of A2DP Advanced Audio Distribution Profile can also be operated with the jog switch from this unit to the BLUETOOTH device except when making a call on this unit Note When you play music by connecting the unit to a BLUETOOTH device using HSP Headset Profile sound quality will not be high For better sound change the BLUETOOTH connection to A2DP by operating the BLUETOOTH device For detail on profiles see page 23 Continued 13 To adjust the volume Push the jog switch up or down to adjust the volume while listening to music Tips When the volume level is low raise the volume of the connected device The sound will be clearer Volume level for calling and listening to music can be set independently To stop use 1 Terminate the BLUETOOTH connection by operating the BLUETOOTH device 2 Press and hold the POWER button for about 3 seconds The indicator blue and indicator red light up together and the unit turns off Tip When you finish playing music the BLUETOOTH connection may terminate automatically depending on the BLUETOOTH device Controlling the audio device AVRCP If the BLUETOOTH audio device connected with this unit supports
4. to turn off the power The indicator blue and indicator red light up together and the unit turns off Continued 17 18 Controlling the BLUETOOTH mobile phone HFP HSP The operation of the buttons on this unit varies depending on your mobile phone HFP Hands free Profile or HSP Headset Profile is used for BLUETOOTH mobile phone Refer to the operating instructions supplied with your BLUETOOTH mobile phone on supported BLUETOOTH profiles or how to operate HFP Hands free Profile Status Multi function button Short Press Long Press Standby Start Voice Last number Dial redial Voice Dial Cancel Voice active Dial Outgoing call End outgoing call Incoming call Answer Reject During call End call Change active device HSP Headset Profile Status Multi function button Short Press Long Press Standby Dial Outgoing call End outgoing End outgoing call 1 call or change active device to headset 2 Incoming call Answer During call End call 3 Change active device to headset l Some functions may not be supported depending on the BLUETOOTH mobile phone 2 This may vary depending on the BLUETOOTH mobile phone 3 Some functions may not be supported when calling using the BLUETOOTH mobile phone Calling while playing back music If the BLUETOOTH connection is active with the mobile phone you can switch the unit to call eve
5. OTH connection to the recognized mobile phone automatically Connection gt Page 16 Talking on the phone You can make and receive a call by operating this unit GETTING STARTED Location and Function of Parts 1 Jog switch Adjusts the volume and controls various functions of the unit 2 Microphone 3j Indicator blue Indicates the communication status of the unit 4 Contact point 5 RESET button POWER button Multi function button Controls various call functions Indicator red Indicates the power status of the unit Earpieces Charging the unit The unit contains a rechargeable Lithium Ion battery which should be charged before using for the first time 1 Connect the supplied 3 Put the unit on the AC power adaptor with the battery charging stand Battery charging stand supplied AC power adaptor supplied 2 Connect the supplied AC power adaptor to an AC outlet To an AC outlet Battery charging battery charging stand Wireless Stereo Headset SE J Contact pin laf Battery charging stand supplied Rest the unit on the battery charging stand so that the unit s contact point meets the contact pin on the battery charging stand and make sure that the indicator red l
6. S ONY 2 696 115 12 1 Wireless Stereo Headset Operating Instructions Bluetooth DR BT20NX 2006 Sony Corporation WARNING To reduce the risk of fire or electric shock do not expose this apparatus to rain or moisture To reduce the risk of electrical shock do not open the cabinet Refer servicing to qualified personnel only Do not install the appliance in a confined space such as a bookcase or built in cabinet To reduce the risk of fire do not cover the ventilation of the apparatus with newspapers tablecloths curtains etc And do not place lighted candles on the apparatus To reduce the risk of fire or electric shock do not place objects filled with liquids such as vases on the apparatus Connect the AC power adaptor to an easily accessible AC outlet Should you notice an abnormality in the AC power adaptor disconnect it from the AC outlet immediately CE Hereby Sony Corp declares that this equipment is in compliance with the essential requirements and other relevant provisions of Directive 1999 5 EC For details please access the following URL http www compliance sony de The Bluetooth word mark and logos are owned by the Bluetooth SIG Inc and any use of such marks by Sony Corporation is under license Other trademarks and trade names are those of their respective owners MPEG Layer 3 audio coding technology and patents licensed from Fraunhofer IIS
7. and Thomson Disposal of Old Electrical amp Electronic Equipment Applicable in the European Union and other European countries with separate collection systems This symbol on the product or on its packaging indicates that this product shall not be treated as household waste Instead it shall be handed over to the applicable collection point for the recycling of electrical and electronic equipment By ensuring this product is disposed of correctly you will help prevent potential negative consequences for the environment and human health which could otherwise be caused by inappropriate waste handling of this product The recycling of materials will help to conserve natural resources For more detailed information about recycling of this product please contact your local Civic Office your household waste disposal service or the shop where you purchased the product Table Of Contents Welcome ccccssseeeeesees 4 3 steps to BLUETOOTH PUNCHON rate ee 5 Location and Function of Parts einen 6 Charging the unit 7 Pairing 00 9 What is pairing 0 0 eee 9 Procedures of pairing 9 Wearing the headset 11 Indications of BLUETOOTH function 12 Listening to music 13 Controlling the audio device AVRCP 005 14 Calling siisii iiis 16 Controlling the BLUETOOTH mobile phone HFP HSP 18 Calling while playing back mus
8. dby for pairing while the unit is turned off p D Uwe A ir Notes After about 3 seconds power is turned on and the indicator blue and indicator red flash together twice Keep the button pressed without releasing until both indicators start flashing together then release the button This unit enters into pairing mode If pairing is not established within about 5 minutes pairing mode will be cancelled and this unit will turn off In this case start over from step 1 Continued Q 10 3 Perform pairing procedure on the connecting device to detect this unit The list of detected devices appears on the display of the connecting device This unit is displayed as DR BT20NX If DR BT20NX is not displayed repeat from step 1 4 Select DR BT20NX on the display of the connecting device 5 If Passcode input is required on the display of a connecting device input 0000 Pairing is complete when the indicator blue flashes slowly The message standing for Pairing complete appears on the display of some BLUETOOTH devices Passcode may be called Passkey PIN code PIN number or Password 6 Start the BLUETOOTH connection from the BLUETOOTH device This unit memorizes the device as the latest connected device Some BLUETOOTH devices may connect with the unit automatically when pairing is complete Whe
9. eless technology operates within a range of about 10 meters about 30 feet Maximum communication range may vary depending on obstacles person metal wall etc or electromagnetic environment The aerial of this unit is built into the unit The sensitivity of BLUETOOTH communication will improve by placing a connected BLUETOOTH device near the unit The following conditions may affect the sensitivity of BLUETOOTH communication There is an obstacle such as a person metal or wall between this unit and BLUETOOTH device A device using 2 4 GHz frequency such as a wireless LAN device cordless telephone or microwave oven is in use near this unit Because BLUETOOTH devices and wireless LAN IEEE802 11b g use the same frequency microwave interference may occur and resulting in communication speed deterioration noise or invalid connection if this unit is used near a wireless LAN device In such as case perform the following Use this unit at least 10 m about 30 ft away from the wireless LAN device If this unit is used within 10 m about 30 ft of a wireless LAN device turn off the wireless LAN device Install this unit and BLUETOOTH device as near to each other as possible e Microwaves emitting from a BLUETOOTH device may affect the operation of electronic medical devices Turn off this unit and other BLUETOOTH devices in the following locations as it may cause an accident
10. ic 19 Disposing of the unit 20 Precautions ssansnsennnnene 21 What is BLUETOOTH technology 23 Troubleshooting 24 Initializing the unit Specifications 26 Welcome Thank you for purchasing this Sony Wireless Stereo Headset This unit uses BLUETOOTH wireless technology e You can enjoy music from your BLUETOOTH device capable of transmitting music e You can enjoy hands free talking with your BLUETOOTH mobile phone inside your bag e You can remotely control the basic functions of BLUETOOTH audio device Play Pause Stop etc e You can charge the unit using the supplied battery charging stand For details on BLUETOOTH technology see page 23 Listening to music Talking on the phone 3 steps to BLUETOOTH function Pairing First register pair a BLUETOOTH device mobile phone etc and this unit with each other Once pairing is established there is no need for pairing again BLUETOOTH mobile phone BLUETOOTH connection Operate the BLUETOOTH device to make the BLUETOOTH connection Connection D Jp Listening to music You can listen to music played on the BLUETOOTH device Playback stop or pause is possible from this unit gt Page 13 15 Wireless Stereo Headset gt Page 9 BLUETOOTH connection When the unit is turned on the unit starts making the BLUETO
11. ights up Charging is completed in about 3 hours and the indicator red goes off automatically Time required for empty battery to recharge Tip When charging the battery the unit is turned off automatically stand supplied Continued 7 Caution If this unit detects a problem while charging the indicator red may turn off although charging is not complete Check for the following causes Ambient temperature exceeds the range of 0 C 40 C 32 F 104 F There is a problem with the battery In this case charge again within the above mentioned temperature range If the problem persists consult your nearest Sony dealer Notes If the battery is not used for a long time battery may be quickly depleted however after a few recharges battery life will improve If the life of the built in rechargeable battery drops to half the normal length the battery should be replaced Consult your nearest Sony dealer for replacement of the rechargeable battery e Avoid exposure to temperature extremes direct sunlight moisture sand dust or mechanical shock Never leave in a car parked in the sun Use only the supplied AC power adaptor Do not use any other AC power adaptor Usage hours Status Approx usage hours Communication 11 hours time including music playback time up to Standby time 100 hours up to Time stated above may vary depending on a
12. leep mode gt The BLUETOOTH connection is terminated Make the BLUETOOTH connection again Distorted sound gt Ensure that this unit is not receiving interference from a wireless LAN other 2 4 GHz wireless device or microwave oven gt Re position this unit The correspondence distance is short Sound skips gt Ifa device that generates electromagnetic radiation such as a wireless LAN other BLUETOOTH device s or a microwave oven is nearby move away from such sources Cannot operate the unit Connection has hung up gt Press the RESET button Pairing information is not deleted by this operation When listening to music No sound gt Check that both this unit and the BLUETOOTH device are turned on gt Check that both this unit and the BLUETOOTH device are making the BLUETOOTH connection A2DP Advanced Audio Distribution Profile gt Check that music is being played back by the BLUETOOTH device gt Check that the volume of the unit is not set too low gt Check that the volume of the BLUETOOTH device is not set too low if the BLUETOOTH device has a volume control gt Pair this unit and BLUETOOTH device again Low sound level gt Turn up the volume of this unit gt Turn up the volume of the BLUETOOTH device if the BLUETOOTH device has a volume control Low sound quality gt Switch the BLUETOOTH connection to A2DP Advanced Audio Distribution Profile
13. mbient temperature or conditions of use Checking the remaining battery When pressing the POWER button while the unit is turned on the indicator red flashes You can check the remaining battery by the number of times the indicator red flashes Indicator red Status 3 times Full 2 times Mid 1 time Low needs to charge Note You cannot check the remaining battery immediately after the unit is turned on or while pairing When the battery is almost empty The indicator red flashes slowly automatically When the battery becomes empty a beep sounds and the unit will turn off automatically Pairing What is pairing BLUETOOTH devices need to be paired with each other beforehand Once BLUETOOTH devices are paired there is no need for pairing again except in the following cases e Pairing information is deleted after repair etc This unit is paired with 9 or more devices This unit can be paired with up to 8 devices if a new device is paired after 8 devices have been paired the device whose latest connection time is the oldest among the 8 paired devices is replaced by the new one e When recognition of the unit by the device to be connected is deleted e This unit is initialized All pairing information is deleted Procedures of pairing 1 Place the connecting device within 1 m 3 ft of this unit Press and hold the POWER button for 7 seconds or more to stan
14. n pairing with a BLUETOOTH device that cannot display a list of detected devices or that has no display You may pair the device by setting both this unit and the connecting device to pairing mode For details refer to the operating instructions supplied with the connecting device Tips To pair with other BLUETOOTH devices repeat steps 1 to 5 for each device To delete all pairing information see Initializing the unit page 25 Wearing the headset Place the neck strap around your neck then wear the earpiece marked in your right ear and the one marked in your left ear The neck strap prevents the earpieces from dropping The right side connector will uncouple for safety if excessive pressure is applied You can conveniently turn the left side connector turn lock in the direction of the arrow and remove it when putting a strap around your neck When you remove the earpieces to wear around your neck slide the cord adjusters toward the earpieces to prevent the cord from tangling How to install the earbuds correctly If the earbuds do not fit your ears correctly low bass sound may not be heard To enjoy better sound quality adjust the earbuds position to sit on your ears comfortably or push them into the inside of your ears so that they fit your ears snugly If the earbuds do not fit your ears try ones of other size How to use the holder Store the earpieces It prevents the cord f
15. n when listening to music Before starting see Calling page 16 on operating details To call while playing back music 1 Press the multi function button while playing back music page 16 or operate your BLUETOOTH mobile phone to make a telephone call If no sound is heard through this unit press and hold the multi function button for about 2 seconds To receive a call while playing back music The sound through the unit changes to a ring tone automatically 1 Press the multi function button and talk After finishing the call press the multi function button This unit is switched back to music playback If the sound does not change to a ring tone automatically 1 Stop music playback 2 When ringing press the multi function button and talk 19 20 ADDITIONAL INFORMATION Disposing of the unit For environmental conservation be sure to remove the built in rechargeable batteries from the unit before disposing and dispose of the batteries appropriately 1 Remove 2 screws using 2 Open the case and a cross point screw remove the built in driver as illustrated rechargeable battery below attached at the lid e Batter y Dispose of the built in rechargeable battery without detaching from the lid Note Forcibly detaching the built in rechargeable battery is liable to damage it and may be dangerous Precautions On BLUETOOTH communication BLUETOOTH wir
16. not press and hold the POWER button for more than 7 seconds otherwise pairing mode is entered Tip This unit will stop trying to connect to the BLUETOOTH mobile phone after 1 minute In such a case press the multi function button to try to connect again When you want to connect the unit to a different BLUETOOTH mobile phone from the last time follow the procedure in When this unit does not connect to a BLUETOOTH mobile phone automatically When this unit does not connect to a BLUETOOTH mobile phone automatically 1 Make the BLUETOOTH connection HFP or HSP from the BLUETOOTH mobile phone to this unit Refer to the manual supplied with your BLUETOOTH mobile phone for operation details The list of recognized devices appears on the display of the BLUETOOTH mobile phone This unit is displayed as DR BT20NX When you use the BLUETOOTH mobile phone features both HFP Hands free Profile and HSP Headset Profile set to HFP For details on profiles see page 23 Note When listening to music by operating this unit connected to a BLUETOOTH mobile phone make the BLUETOOTH connection by operating the BLUETOOTH mobile phone This cannot be done with the multi function button To call 1 Use the buttons on your mobile phone when making a call If no sound is heard through this unit press the multi function button Tip You can call in the following way depending on the BLUETOOTH mobile
17. rom tangling if you store the earbuds 11 12 Indications of BLUETOOTH function Status Lvs Indicator blue Indicator red pe Flashing patterns Searching W Connectable Connecting Connecting Pairing HFP HSP or A2DP standby for receiving audio signal HFP HSP and A2DP standby for receiving audio signal Connected Listening Music Listening during standby for telephone call Incoming call Talking Phone Calling while playing back music J W W W W W W W W OPERATING THE UNIT Listening to music Jog switch VOL POWER button Check the following before operating the unit The BLUETOOTH device is turned on Pairing of this unit and the BLUETOOTH device is complete The BLUETOOTH device supports the transmitting music function profile A2DP 1 Press and hold the POWER button for about 3 seconds while the unit is turned off The indicator blue and indicator red flash together twice and the unit is turned on Note Do not press and hold the POWER button for more than 7 seconds otherwise pairing mode is entered 2
18. specifications are subject to change without notice eee ME Printed in Malaysia 2 6 9 6 1 1
19. stions or problems concerning this unit that are not covered in this manual please consult your nearest Sony dealer What is BLUETOOTH technology BLUETOOTH wireless technology is a short range wireless technology that enables wireless data communication between digital devices such as a computer or digital camera BLUETOOTH wireless technology operates within a range of about 10 meters about 30 feet Connecting two devices as necessary is common but some devices can be connected to multiple devices at the same time You do not need to use a cable for connection since BLUETOOTH technology is a wireless technology nor is it necessary for the devices to face one another such is the case with infrared technology For example you can use such a device in a bag or pocket BLUETOOTH technology is an international standard supported by millions of companies all over the world and employed by various companies worldwide Communication System and Compatible BLUETOOTH Profiles of this unit Profile is standardization of the function for each BLUETOOTH device specification This unit supports the following BLUETOOTH version and profiles Communication System BLUETOOTH Specification version 2 0 Compatible BLUETOOTH Profiles A2DP Advanced Audio Distribution Profile Transmitting or receiving audio content of high quality AVRCP Audio Video Remote Control Profile Controlling A V equipment pausing
20. stopping starting playback volume control etc HSP Headset Profile Talking on the phone Operating the phone HFP Hands free Profile Talking on the phone Operating the phone by hands free When you use a BLUETOOTH mobile phone supported by both HFP Hands free Profile and HSP Headset Profile set to HFP Note To be able to use the BLUETOOTH function the BLUETOOTH device to be connected requires the same profile as the unit s Note also that even if the same profile exists devices may vary in function depending on their specifications 23 24 Troubleshooting If you run into any problems using this unit use the following checklist Should any problem persist consult your nearest Sony dealer Common The unit is not turned on gt Charge the battery of the unit gt The unit is not turned on while charging Remove the unit from the battery charging stand and then turn on the unit Pairing cannot be done gt Bring this unit and the BLUETOOTH device closer together Cannot make the BLUETOOTH connection gt Check that this unit is turned on gt Check that the BLUETOOTH connecting device is turned on and the BLUETOOTH function is on gt Connection with the BLUETOOTH device may not be memorized on this unit Make the BLUETOOTH connection from the BLUETOOTH device to this unit soon after pairing is complete gt This unit or BLUETOOTH connecting device is in s
21. t To remove the AC power adaptor from the wall outlet grasp the adaptor plug itself never pull the cord Others Do not place this unit in a place exposed to humidity dust soot or steam subject to direct sunlight or in a car waiting at a traffic signal It may cause a malfunction Using the BLUETOOTH device may not function on mobile phones depending on radio wave conditions and location where the equipment is being used e If you experience discomfort after using the BLUETOOTH device stop using the BLUETOOTH device immediately Should any problem persist consult your nearest Sony dealer Do not allow small children to use this unit Do not use this unit in a place where it may be snagged such as near a shredder or machine facility etc The left and right connectors will uncouple for safety if excessive pressure is applied To reduce the risk of this unit from falling avoid excessive movement e Listening with this unit at high volume may affect your hearing For traffic safety do not use this unit while driving or cycling If the earbuds become wet wipe it with a dry towel before using Clean the earbuds by hand washing with a mild detergent solution Remove the earbuds when you clean them After cleaning dry the earbuds well before use The earbuds may deteriorate due to long term storage or use Do not strain the cord when adjusting the length as it may be damaged If you have any que
22. when HSP Headset Profile is set When calling The recipient s voice cannot be heard gt Check that both this unit and the BLUETOOTH mobile phone are turned on gt Check the connection between this unit and the BLUETOOTH mobile phone gt Check that output of the BLUETOOTH mobile phone is set for this unit gt Check that the volume of the unit is not set too low gt Check that the volume of the BLUETOOTH mobile phone is not set too low if the BLUETOOTH mobile phone has a volume control gt If you are listening to music using this unit stop playback press the multi function button and talk Low sound from recipient gt Turn up the volume of this unit gt Turn up the volume of the BLUETOOTH mobile phone if the BLUETOOTH mobile phone has a volume control Initializing the unit You can reset this unit to its default such as volume setting and delete all pairing information 1 If this unit is turned on press and hold the POWER button for about 3 seconds to turn off this unit 2 Press and hold the POWER button and multi function button together for about 7 seconds The indicator blue and indicator red flash together four times and this unit is reset to the default setting All pairing information is deleted 25 26 Specifications General Communication System BLUETOOTH Specification version 2 0 Output BLUETOOTH Specification Power Class 2 Ma
23. where inflammable gas is present in a hospital train airplane or a petrol station near automatic doors or a fire alarm This unit supports security capabilities that comply with the BLUETOOTH standard to provide a secure connection when the BLUETOOTH wireless technology is used but security may not be enough depending on the setting Be careful when communicating using BLUETOOTH wireless technology We do not take any responsibility for the leakage of information during BLUETOOTH communication Connection with all BLUETOOTH devices cannot be guaranteed A device featuring BLUETOOTH function is required to conform to the BLUETOOTH standard specified by BLUETOOTH SIG and be authenticated Even if the connected device conforms to the above mentioned BLUETOOTH standard some devices may not be connected or work correctly depending on the features or specifications of the device While talking on the phone hands free noise may occur depending on the device or communication environment Depending on the device to be connected it may require some time to start communication Continued 21 22 On the supplied AC power adaptor Use the AC power adaptor supplied with this unit Do not use any other AC power adaptor since it may cause the unit to malfunction DA Polarity of the plug If you are not going to use this unit for a long time unplug the AC power adaptor from the AC outle
24. ximum communication range Line of sight approx 10 m 30 ft Frequency band 2 4 GHz band 2 4000 GHz 2 4835 GHz Modulation method FHSS Compatible BLUETOOTH Profiles A2DP Advanced Audio Distribution Profile AVRCP Audio Video Remote Control Profile HSP Headset Profile HFP Hands free Profile Supported Codecs SBC MP3 Supplied Accessories AC power adaptor 1 Battery charging stand 1 Earbuds S x 2 M x 2 L x 2 Holder 1 l The actual range will vary depending on factors such as obstacles between devices magnetic fields around a microwave oven static electricity reception sensitivity aerial s performance operating system software application etc 2 BLUETOOTH standard profiles indicate the purpose of BLUETOOTH communication between devices 3 Codec Audio signal compression and conversion format 4 Subband Codec Headset Power source DC 3 7 V Built in lithium ion rechargeable battery Strap Approx 0 35 m 13 7 s in Cord from unit to earpiece Approx 0 4 m 15 4 in Mass Mass Approx 33 g 1 17 oz including strap and earpieces Earpieces Approx 4 g 0 15 oz not including cord Rated power consumption 1 5 W Receiver Type Closed dynamic Driver unit 9 mm dome type CCAW adopted Reproduction frequency range 20 20 000 Hz Microphone Type Omni directional electret condenser Effective frequency range 100 4 000 Hz Design and
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