owner`s manual wireless meeting system
Contents
1. Identify room layout 2 2 1 Check coverage area Real coverage area of conference room usually coverage area of conference room is smaller than the conference room area Conference room area a holalatalalalalalalalalalalalalalalalalelallalalalal re lb lel elblalkibt bia lala D d Control room Antenna radius 60 meters Real coverage area 2 2 2 System configuration Description __ __ ModelNo Max Qty Marks Receiver unit Chairman Microphone o a S Delegate Microphone s255 ooo Data Control Antenna ooo oo a o Audio Control Antenna o o s S o Battery Charger o S o o LIP Battery 2 3 Installation and connection of receiver unit 2 3 1 Receiver unit installation a Put on the table or install in 19 inch frame b Please keep away from high power and strong radiation equipments or it may influence the equipment performance c Use it in a well ventilated area 1 2 3 2 Antenna connection There are 4 antennas of receiver unit 1 piece data control antenna 426MHz 1 piece chairman microphone audio control RF antenna A 750MHz and 2 pieces delegate microphone audio control RF antenna B 780MHz 426MHz Nene Bs 780MHz B 780MHz A 750MHz gt Please note Receiver antennas should be connected correct position or system can not work properly 2 3 3 Receiver unit to sound system a Mono output Please connect MIX OUT interface of receiver unit to input int2. the charging terminals dirty x Clean the charging terminals can not be charged x Has the battery been left for a x Replace it with new one x The charging lamp does not long time after charging light x Can other batteries be charged x The charging lamp is flashing x Charging does not complete after 12 hours 1 The battery life is usually approximately 300 charge cycles 2 If battery capacity display in microphone LCD is flash it means that battery capacity is low user should turn off that mic and charge the battery 3 Take out the battery if the microphone will not use for a long time 19
3. 0 channels for option in this bandwidth frequency interval is 250 KHz Delegate microphone D1 D2 D3 D4 audio channel v Channel setting method please see chairman microphone audio channel setting method v Delegate microphone audio description Bandwidth of delegate microphone is 25M default setting is 765MHz 789 75MHz Please contact us or agent to get more information if user want choose other frequency for delegate microphone There are 100 channels for option in this bandwidth frequency interval is 250 KHz v Please note there are 4 audio channel of the delegate microphone in the system so the channel number cannot be same 16 d System project setting Press SET key and turn on the receiver with POWER key at the same time receiver LCD will display m Sena there are 4 setting menu in this part Menu Receiver data room channel setting Default channel is ROOM 0 there are 16 data room channel for option 0 1 2 3 4 5 6 7 8 9 A B C D E F user can select the channel by UP and DOWN key and press SET to save the setting receiver will switch to next setting part automatically This system use room number to show the data control channel if there are more than 1 system used in the same place or building we suggest user to set different room number data channel in order to avoid interface If other equipment has same frequency of the data channel use also can change it Delegate microphone audio channel the
4. 300 charge cycles d Easy to install 1 5 3 Schematic diagram of Lithium battery 1 Battery detach lock button 2 Negative 3 Positive 1 5 4 Parameter of Lithium battery N N Rated voltage DC3 7V Discharge current lt 500mA Charging current lt 700mA Time of speaking gt 8 hours Time of standby Charging voltage DC5V Dimensions 47x40x12mm N W System installation L Warning This is a wireless communication system use UHF band carrier frequency We recommend that users consult local radio management committee to choose the appropriate and legally available frequency in order to avoid RF interference If the units demonstrate any problems such as abnormal sound smoke heat from or damage to power cables disconnect the power plug from the outlet and contact your sales representative If the power plug blades are distorted or discolored do not use the unit Receiver unit Battery charger Uncoil the power cables before use Do not bundle the cables during use or fie with nails Receiver unit Battery charger Do not pull on the cable Hold the plug section and insert remove it in a straight line damaged cables may result in electric shock malfunction or fire Receiver unit Battery charger Do not place anything on the power cables Do not route them under a rug or furniture Receiver unit Battery charger Do not cover the units with cloth or place them in locations with poor ventilation Doing so tr
5. Chairman Only microphones in one system up to 256 units 5 microphones can be turned on at the same time Microphones can be operated on either their built in rechargeable batteries Battery life approx 8 hours during speech and approx 30 hours when standby Wireless communication system eliminates the need of connecting the conference units Installation can be done quick and smart without cumbersome arrangements Adopt multi channel high band and intermediate band frequency selective filtering fully eliminate interference signal Built in feedback eliminating technology which can decrease the feedback and nois e effectively Built in multiple noise detecting circuit and TONE LOCK system to make sure the system has strong anti jamming function Operation distance up to 100 meters with the best condition 60 meters in normal condition Support video camera auto track function with video processor 1 2 Wireless meeting system receiver unit 1 2 1 Picture of the actual object 1 2 2 Features of wireless meeting system receiver unit Support Mode Limit 1 2 3 4 FIFO 1 2 3 4 Chairman Only Support video camera auto track with video processor 160x32 dot matrix LCD display system information Receiver can control the microphone status when powered off such as clear or shutting off all microphones Designed accordance to UL CE and RTTE standards Installation 19 inch frame 1 2 3 Schematic diagram of wireless meeting
6. OWNER S MANUAL WIRELESS MEETING SYSTEM Version REV1 0 2013 Table of Contents Overview i System Configuration and deseri pon ressa esse ase ae 2 LL SySlenyTeatul eS sass enedesesse dele esse sen ees saan ee senee Esser R 2 1 2 Wireless meeting System receiver Unit se gt ss4 _s2 es4s secec Soe sag n eae see oeeeraeaa 2 G21 Picture OF tne actual ODIJECE see se ssasasaes see se ed saa saa see sete eae Sse esse ae lease 2 1 2 2 Features of wireless meeting system receiver unit 3 1 2 3 Schematic diagram of wireless meeting system receiver unit 3 1 2 4 Parameter of wireless meeting system receiver unit 4 1 3 Wireless meeting system microphone unit 4 Lel PICe OF Tne actual opec 4s244 54sssssee eee nac ata n eee ae se eeee anaes a tat seree asses 4 1 3 2 Features of wireless delegate microphone unit 5 1 3 3 Features of wireless chairman microphone unit 5 1 3 4 Schematic diagram of wireless microphone 5 1 3 5 Parameter of Parameter of wireless microphone 6 L4 Battery Chalden se sssseseeessesneesen sores secre ean a 7 Kad PICCUrE Ol tne dactal OD JECL 222 2 gt s a Stes earns saee eee ea eee aes 7 KAZ Features Of battery Chal Q Hs ss2s easssae
7. S See a ses ce eens Soe sea eae ese 12 2 39 07 RECEIVE UNIT TO SOUNG SY SleI 22e5Fe aaa sass ee 12 2 3 4 RECEIVE UNIE LO VIGEO DrOCeSsOfess sesess ase sea sone ass a 13 2 3 0 Receiver unit to external antenna s4 45 e8s s44 oseesceeae sete ssa oneee ee eeae 13 2 4 Installation of wireless microphone unit 13 2 4 1 Mounting and dismounting the battery 13 2 4 2 Mounting and dismounting the microphone 14 Zed oy Stem SCLUIN G aa ase e sae aa SaaS a Seee Saas ees Sone eres e aes ase eS aes 14 Zui IRECCIVEF UNIE SECIING se s sssnesees sss ssses ae ae aa aa ESE sees 14 2 5 2 MICFOpnOne Setting and Operation sssees gt gt anes saree Senshi oes anes oor arse nesaseoe 18 3 TFOUDIESNOOUNG eiei aaa 19 Overview With high flexibility and reliability our UHF wireless conference system is an ideal choice for mobile conference systems It offers simple operation compact structures The wireless conference system can be perfectly integrated into any meeting rooms without additional wiring It s the best wireless conference solutions for small scale conferences 1 System Configuration and description Wireless meeting system receiver unit wireless chairman microphone wireless delegate microphone battery charger etc 1 1 System features Support Mode Limit 1 2 3 4 FIFO 1 2 3 4
8. aps heat and may result in electric shock or fire If you do not use the units for long periods of time disconnect the power plugs from the outlet Receiver unit Battery charger Do not disassemble the units Touching the inside of the units may result in electric shock Do not expose the units to any strong shock Do not expose the units to direct sunlight heat from heating appliances high temperatures or dust Do not expose the units to high humidity or moisture Water that accidentally enters the inside of the units may result in electric shock malfunction or fire Do not touch the power cables or plugs with wet band 9 N Receiver unit Battery charger Main unit is a class I device Be certain to connect to an AC outlet with a protective grounding connection Main unit can be separated from the AC receptacle by turning off the unit by the front power switch In case of emergency turn off this switch or unplug the power cable from the AC receptacle 1 1 CAUTION on handling of the microphone unit Do not grasp the microphone to lift or pull on the microphone unit pick up the unit by its base Slowly bend and straighten the flexible part of the microphone Do not bend it with excessive force Do not drop the unit If you do not use the unit for long periods of time remove the battery The dedicated lithium ion battery should be used Do not place any obstructions around the microphone units When the microphone units are too close
9. ceiver panel are not available to used for setting g Checking system audio and data channel User can check the system audio and data Room channel by UP and DOWN key User can check the chairman microphone C and delegate microphones D1 D2 D3 D4 audio channel data room channel frequency point even the system locked We recommend user to use auto scan function if any interference in each channels System will shut off all microphones include chairman microphone if user save the setting If the system can working properly after testing we strongly recommend user to lock 17 the system setting 2 5 2 Microphone setting amp operation There are 3 function keys on microphone unit Include chairman microphone Q b POWER ON OFF PRIOR VOL VOL MUTE Microphone function key description POWER Press this key to power on or power off the microphone ON OFF Microphone will on off in correct communication mode If the microphone data channel is different from receiver data channel user can not turn on the microphone PRIOR Chairman microphone priority key it can turn off all delegate microphone with this key VOL Decrease the volume level of microphone VOL Increase the volume level of microphone MUTE Prevention on speaker s cough Microphone project setting Press MUTE key and turn on the microphone with POWER key at the same time microphone will enter project setting There are four setting i
10. dio channel Wireless two way Data channel ft ooo Data control Moduaton meroa e channel Standby lt 360mW Consumption Rating System Speaking lt 630mW Operating temperature range 10 40 degree Dimensions 170x58x120mm 0 7kg 1 4 Battery charger 1 4 1 Picture of the actual object 1 4 2 Features of battery charger a b Charges 16 PCS of lithium battery per charging C d Equipped with extendable handle and pulley easy for moving Input Voltage AC 110V 220V Intelligent charging management electro circuit to protect the LIP battery 1 4 3 Schematic diagram of battery charger Nooo 1 Pulley 2 Extendable handle 3 Charging status indicator LED 4 Battery holder 5 Power indicator 6 Power on off switch 7 AC adapter jack AC110V 220V 50Hz 60Hz 1 4 4 Parameter of battery charger Power supply 110V 240V 50HzZ 60Hz Consumption Rating 200W Charge quantity MAX charging current of each 700mA Charging time About 8 10 hours Charging status Red LED flashing Charging Green LED Full Operating temperature range 0 40 degree Dimensions 620x370x175mm N W 1 5 Wireless meeting system Lithium battery 1 5 1 Picture of the actual object 1 5 2 Features of Lithium battery a Excellent safety performance light weight amp High capacity ratio b Improved safety more resistant to overcharge less change for electrolyte leakage c The battery life is usually approximately
11. e priority button was press on the chairman microphone is turn on while the delegate microphone being turn off until the priority button is released or delegate microphone can not turn on again Mode setting method Press SET key one or several times till CFREE character flashing press DOWN the flashing character will change to CONLY press UP the flashing character will change to CFREE and then press SET to save it or wait about 3 seconds the system will save the mode automatically characters will stop flashing C FREE When chairman microphone priority button was press on the chairman microphone is turn on while the delegate microphone being turn off but delegate microphone can be turned on again even chairman microphone not released priority button Mode setting method please see C ONLY setting method e 1MAX LIMIT System only allowed 1 piece delegate microphone turned on at the same time if other delegate microphones want turn on user should turn off that microphone first Number setting method Press SET key one or several times till 4MAX character flashing press DOWN or UP key till the flashing character change to 1MAX and then press SET to save it or wait about 3 seconds the system will save the setting automatically characters will stop flashing Mode setting method Press SET key one or several times till FIFO character flashing press UP key the flashing character change to LIMIT press DOWN the flashi
12. erface of sound equipment by 6 3 audio cable for short distance ANT DATA BATA b Balance output Please connect MIX BAL interface of receiver unit to input interface of sound equipment by XLR M balance audio cable for long distance Speaker 2 3 4 Receiver unit to video processor a High Speed Dome Camera a7 a ae Projector 0000000000 d b CAT 5 RJ45 ANT DATA BATA Please connect DATA interface of receiver unit to DATA interface of video processor by RJ45 network cable Please read the user manual of video processor 2 3 5 Receiver unit to external antenna If the distance between receiver and microphone is not far and there does not have any obstruct antenna can be connect to the ANT interface of receiver unit rear panel directly If the distance is far or have some obstruct between them please connect external antenna to receiver unit gt Please note coaxial cable should be 50 2 4 Installation of wireless microphone unit 2 4 1 Mounting the battery Take out battery cover Mounting battery Mounting battery cover Mounting battery Take out the battery cover on the bottom side of the microphone unit insert the battery in the direction of the arrow to fasten it and then mounting the battery cover Listen for the click sound and make sure the battery cover is securely fixed 2 4 2 Mounting and dismounting the microphone Mounting microphone Insert the microphone into the micr
13. n this part Microphone data room channel setting Default channel is ROOM 0 there are 16 data room channel for option 0 1 2 3 4 5 6 7 8 9 A B C D E F user can select the channel by VOL and VOL key and press MUTE to save the setting Microphone will switch to next setting part automatically User can see receiver data channel setting for reference Microphone ID setting Chairman microphone ID number can be set from 0 9 A F total 16 ID for option delegate microphone ID number can be set from 0 255 total 256 ID for option User can select the ID by VOL and VOL key and press MUTE to save the setting Microphone will switch to next setting part automatically Please note All microphone ID in one system should be different if any units have the same ID number the system will not work properly If system connect video processor to support video camera auto track function chairman microphone ID should be 1 Chime of chairman microphone When chairman microphone turned on system will give a chime indicative sound User can press VOL to close this function and press VOL to open this function Microphone working mode Default mode is LINK User can press VOL switch to FREE mode and press VOL switch to LINK mode In Free mode microphone can be tuned on off any time with communicate with receiver unit and user can set the microphone audio channel when microphone is off press MUTE key audio channel number will flash use
14. ng character will change back to FIFO and then press SET to save it or wait about 3 seconds the system will save the setting automatically characters will stop flashing e 2MAX LIMIT System only allowed 2 pieces delegate microphones turned on at the same time if other delegate microphones want turn on user should turn off 1 or 2 microphones first Setting method please see LMAX LI MIT setting method 3MAX LIMIT System only allowed 3 pieces delegate microphones turned on at the same time if other delegate microphones want turn on user should turn off 1 2 or 3 microphones first Setting method please see 1MAX LI MIT setting method 4MAX LI MIT System only allowed 4 pieces delegate microphones turned on at the same time if other delegate microphones want turn on user should turn off 1 2 3 or 4 microphones first Setting method please see LMAX LI MIT setting method 1MAX FIFO System only allowed 1 piece delegate microphones turned on at the same time if other delegate microphone turns on system will turn off the first on microphone automatically First in first out first indicate first offer 15 Setting method please see LMAX LI MIT setting method 2MAX FIFO System only allowed 2 piece delegate microphones turned on at the same time if other delegate microphone turns on system will turn off the first on microphone automatically Setting method please see LMAX LI MIT setting method 3MAX FIFO System only allo
15. one Portable table moving and microphone pipe can be pull out Extended pipe option Electric capacity type microphone equipped with windshield cover LCD display microphone ID battery level microphone state control channel etc Equipped with microphone on off key and indicator Equipped with 3 function keys to set microphone id control channel volume level and battery status Microphone will shut off the power or in standby if receiver powered off 0 1 3 3 Features of wireless chairman microphone Including the functions of the delegate unit chairman unit has other following functions Chairman microphone can turn on any time Ifthe system support video camera auto track function chairman microphone ID number should be 1 Priority function chairman can turn off delegate microphones by clear key any time Chairman only mode Delegate microphone can not be turned on again after chairman microphone press priority button The chairman need quit this mode first and then delegate microphone can be turned on again 1 3 4 Schematic diagram of wireless microphone 1 Unidirectional electret MIC 2 Annular red indicator lamp to show the microphone state 3 Mute Set key 4 Mic volume up key 5 Mic volume up down key 6 MIC ON OFF key 7 Chairman Priority 8 LCD 9 Microphone power switch 1 3 5 Parameter of wireless meeting system microphone unit fttems Parameter Modulation method FM Au
16. ophone mounting socket in a Straight line and then rotate the microphone clockwise to fasten it securely Dismounting microphone Rotate the microphone counterclockwise then pull the microphone upward to dismounting Please contact us if you need more detailed information during your installation 2 5 System setting 2 5 1 Receiver unit setting a POWER ON POWER OFF b POWER ON Hold the POWER button on the left front panel of receiver till LCD display and then release it LCD will display Wireless Meeting after system self detecting LCD will display CFREE 4Max Adh i POWER OFF Hold the POWER button on the left front panel of receiver till LCD display gess Meets i receiver unit will powered off and all microphones in standby status when released the button If still hold the button LCD will display 5 Wireless Meeting both receiver and microphones are powered off at the same time Power Off initialize System function key There are 3 function keys on receiver unit SET S DOWN UP System mode setting System default mode CFREE 4MAX FI FO System support 10 modes setting by receiver unit FIFO 1 2 3 4 LIMIT 1 2 3 4 CONLY CFREE user can set these mode by UP amp DOWN key System will save and keep the last setting mode in 3 seconds automatically or press SET key to save the 14 mode immediately C ONLY When chairman microphon
17. r can press VOL and VOL key to select the audio channel FREE mode just used for testing In LINK mode microphone must work and communicate with receiver unit or microphone can not turn on microphone audio channel was distributed by receiver unit Exit microphone project setting Press microphone on or POWER key to exit if there is no action of the microphone microphone will exit the setting in 9 secs 3 Troubleshooting The microphone unit shut off x Check the battery capacity x The batteries must be charged automatically before initial use x Charge before use The receiver unit is not turn on x Is power plug inserted into the x Insert power plug into the outlet outlet Microphone can not turned on x Is the correct data channel x Receiver and microphone data properly number set channel should be same x Is the receiver antenna installed x Install the antenna in correct correct position x Is there any obstruction between x Install externed antenna or the microphone unit and antenna amplifier receiver or the distance x Set the new data channel and between the microphone and audio channel receiver is too far x Is any inference of the frequency More than 1 microphone turned x Is the microphone ID number x Set the ID number again on off at the same time same of the Operating time x The battery is dying 1 microphone unit battery is x Purchase a new battery short The microphone unit battery x Are
18. receiver will switch to delegate microphone audio channel setting automatically after user save the setting of receiver data channel v Q Audio channel not available 1 Audio channel not available v Setting method of Channel 1 Press DOWN key to close this channel and press UP key to open this channel press SET key to save the setting and receiver will switch to next setting part automatically v Setting method of channel 2 3 4 Please see the setting of channel 1 Y Description of this setting Receiver use 4 channel LNB to support 4 delegate microphones FM high frequency signals Default sort order is D1 D2 D3 D4 If there is some problem of D1 then system microphone can not turn on off properly user can set this channel not available then receiver LNB default sort order is D2 D3 D4 and only support 3 delegate microphones working at the same time maximum This setting just for urgently situation please contact local agent or us to get the solution Y Hold and press SET key press POWER key till LCD display 2 3 to exit the project setting l f System lock amp unlock Lock setting method Press and hold the SET key first and press UP key at the same time system LCD will display P kaes e Unlock setting method Press and hold the SET key first and press DOWN key at the same time system LCD will display Y n Ssyboer Please note if the system locked the function keys on the re
19. ssese Sessa s eae eeses eee esa sean seeeesHesa 7 LAS Schematic diagram OfDattery charges insescepmi ne nd asses aneeeoees 7 14 4 Parameter Of Datlery charge se a essa ae Sareea soc asses eee soe seaaresesce 8 1 5 Wireless meeting system Lithium battery 8 LSL Picture OF The delual OD CCl se ssass os amb esee ees soees a 8 1 502 Features OMENIM OALE y 2ss4 20s seet eos a asses escent aaa Sen ede acaee esas ass 8 1 5 3 Schematic Gdlagram or LItniUmM attep sss 8 Lot Parameter OF LENM Dalley 2244 sesso se aes ee SoS s sso eee te eestiee eee ea soeee 9 2 SY SLE INStaIIALION SaseseeenS ss shee ese ssa esses EE 9 Zod Waning esee eases asa ses e ea aaa eee Sees en ees eas saeStacas 9 2 1 1 CAUTION on handling of the microphone unit 10 2 1 2 CAUTION on battery charger handling 10 2 1 3 CAUTION on battery handing 10 2 2 AGentIny FOOM layOULs s lt 44ssseseseq sass e se see eee aan seen ae sateen esese oes 11 2oeil Check coverage al Cassnee ace sass saree Ses os seen aneeesesescseaeSesteeaer 11 2 22 SYSteM COnfOQUrall ONa 4 2 se5es ss ses aaa 11 2 3 Installation and connection of receiver unit 11 2 30k Recover UNILNSlall allONas4s94ese 422s e sete ee aaa eaesenee 11 2 572 ANENA CONNECLION 5sa gt SSsse ce se a steseaa n
20. system receiver unit or e Oo o ow O s O x o Or e a wT Bew l e en8a00 12 13 14 15 16 17 18 19 1 Power switch 2 RF Audio Level indicator First channel only for chairman mic the last four channels for delegate mic 3 Volume knob of chairman microphone Channel 1 4 Volume knob of delegate microphone Channel 2 5 Volume knob of delegate microphone Channel 3 6 Volume knob of delegate microphone Channel 4 7 Volume knob of delegate microphone Channel 5 8 Setting key check channel frequency 9 Menu 10 Setting key check channel frequency 11 LCD Display current mode frequency point of each channel 12 ANT DATA System data control antenna interface 13 DATA External video processor connection interface 14 DC Power input 15 MIX OUT Mixed audio output 16 MIX BAL Mixed audio balance output 17 ANT B Delegate mic RF antenna interface 18 ANT B Delegate mic RF antenna interface 19 ANT A Chairman mic RF antenna interface 3 1 2 4 Parameter of wireless meeting system receiver unit items Parameter Audio channel 100dBM Data control channel Frequency deviation Power supply DC12 15V lt 1A Signal covering range Radius 60 meters Consumption Rating System Operating temperature range 10 40 degree Dimensions 485x355x85mm N W 7kg 1 3 Wireless meeting system microphone unit 1 3 1 Picture of the actual object 1 3 2 Features of wireless delegate microph
21. together high sound volume may cause acoustic feedback In this case increase the space between the conference units or turn down the volume After the battery has been removed and replaced confirm that the power LED turns off L 2 CAUTION on battery charger handling If the charging terminal is dirty poor contact will prevent the battery from being charged properly Periodically clean the charging terminals The battery charger may become hot during charging Use it in a well ventilated area After the battery is fully charged turn off the battery charger or remove the batteries 1 3 CAUTION on battery handling The battery is dedicated to the microphone unit Do not use it for other applications Use only the designated battery charger If the battery leaks and the liquid contacts your skin or clothing immediately flush with clean water If the battery leaks and the liquid contacts your eyes immediately wash thoroughly with clean water and seek medical assistance Do not throw the battery into fire or overheat it Doing so may result in a fire Do not disassemble or modify the battery Do not short circuit the and terminals with any metal or wire Do not carry or store the battery with metal products such as a necklace If you discover battery leaks discoloration distortion or the other problems do not use the battery Dispose of used batteries properly as industrial waste or contact our business office in your neighborhood 2 2
22. wed 3 piece delegate microphones turned on at the same time if other delegate microphone turns on system will turn off the first on microphone automatically Setting method please see LMAX LI MIT setting method 4MAX FIFO System only allowed 4 piece delegate microphones turned on at the same time if other delegate microphone turns on system will turn off the first on microphone automatically Setting method please see LMAX LI MIT setting method Please note Chairman microphone is not limit in these mode chairman microphone can be turned on and off independently System audio channel setting System default audio channel 40 05 35 65 95 Chairman microphone audio channel v Manual setting Press SET key one or several times till 40 character flashing press DOWN or UP key to select the channel and then press SET to save it or wait about 3 seconds the system will save the setting automatically characters will stop flashing v Auto scan setting Press SET key one or several times till 40 character flashing and then press and hold the SET key till LCD display symbol release the key system will scan all audio channel 00 99 automatically and select the best one to save it v Chairman microphone audio description Bandwidth of chairman microphone is 25M default setting is 740MHz 764 75MHz Please contact us or agent to get more information if user want choose other frequency for chairman microphone There are 10
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