Portable card FM transmitter
Dear customer :
Thanks for ordering our portable plug in card type FM transmitter model HRD-831. This product build up with
High quality import electronic components , with super long power up to 20 hours , one button for mono / stereo audio
exchange , 16 sound level can be adjusted , with separate AUX audio input port , MIC microphone input port and key lock
function . Adjustable frequency 88.1-107.9 MHz ( can also set to fixed frequency )
good anti interference power for better security , suitable for tourist guide , training course , traveling , study activities .
Please read the manual in detail before use and keep the manual for later inquiry .
1) Product function diagram :
① LCD display
② TF card port ( support MP3 format )
③ Mic port
④ 3.5 mm AUX port
⑤ Power on / off button
⑥ PREV - frequency , volume increase switch , long press for mono / stereo interchange
⑦ NEXT - frequency , volume decrease switch , long press for frequency lock
⑧ MENU - interchange button for MIC / AUX / FM
⑨ ▷‖Play / pause
⑩ Lock switch
⑪ battery cover
⑫、Waistband
一、：Operation :
1. Push open battery cover , insert BL-5C Li battery , close battery cover
2. Long press power button ⑥ to power on,
(2.1) Internal MP3 playing : In condition no audio input in AUX port ⑤, insert TF card to enter MP3 playing mode ,
transmitter with automatically read card and play music , short press PREV⑦，NEXT⑧ for previous / next song , short
press ▷‖⑩ for play / pause
(2.2) Play external audio : connect AUX⑤port using audio cable to PC / TV / mobile to play external audio , unplug
audio cable in AUX playing mode will automatically change to TF card playing mode in 3 seconds.
(2.3) insert microphone to MIC port for chatting
3. Function interchange :
Short press MENU button , MIC / AUX / FM flashing in sequence。
When “MIC” flashing , short press PREV⑦,NEXT⑧ to adjust Mic volume
When “AUX” flashing , short press short press PREV⑦,NEXT⑧ to adjust AUX volume
When “FM” flashing , short press PREV⑦,NEXT⑧ to adjust frequency
( if transmitter locked frequency 88.1MHz , long press NEXT button for frequency exchange )
4. Lock / unlock method :
（1）In normal condition , long press LOCK button , icon appear in display , function locked.
（2） In locked condition , long press LOCK button to release locking function , icon disappear.
5. Charging
(1) Connect transmitter to DC5V charging adapter by USB charging cable , icon flashing to indicate charging in
process .
(2) Icon stop flashing upon fully charged , charging time around 5 hours
6. Long press PREV button for 2 seconds to interchange mono / stereo mode , STEREO appear on display is stereo mode .
二、Notice for operate the product :
1. Maintenance should be done by professional technician
2. Please do not use it in easy explosive circumstance ( such as gas station , steam room )
3. Please don’t place transmitter in high dusty , high temperature & high humidity condition.
4. Please follow the rules set by Administration of radio
5. Please don’t use the device in stormy weather.
三、Product feature :
1. This product using professional IC , high quality audio can be separate handled to obtain lossless audio
2. Professional level of noise wave / harmonic wave , ≤60dB , get rid of surrounding interference
3. Mono / stereo easily interchange , easy operate
4. Suitable applicant / organization
Driving college / school / stage director / public speech / tourist / vehicle mounted chatting , MP3 audio forward / in
house wireless audio system / wireless meeting system / simultaneous interpretation / outdoor traveling
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