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Q:why the Sound is very weakA:The sound not only depends on the mic volume but also depends on fm receiver volume.So please add the volume of microphone with pressing "+" once by once(Do NOT hold on ). And also please volume up fm receiver.If no sound after adjust the volume, the wireless maybe disconnected and please re-pair it via adjust transmitter and receiver to same frequencyEasy OperateYou just need to find a frequency,which there is no fm station,such as FM 94.4,then only need Adjust the receiver and transmitter in the same frequency via the front and back buttonsFM receivers with 5 presetsSpecial 5 station presets design used simultaneously without interference as Wireless FM Transmitter Receiver for Guided Tour Language InterpretationExpandable & DIY1 transmitter can pair up to Countless receivers. If you have more than one Tour guide or speech area you would like to add, just DIY and fulfill your needsWide UsePerfect for teaching, tour guide, sales, speech, conference, meeting, karaoke,church translation,etc with High anti-interfering abilitySpecification:Wireless MICVolume control: 1-15 levelsTransmit power: ≤10mWReceive distance: ≤30 meters (98ft)Power supply: built-in 450mAh lithium batteryCharging time: 2-3 hoursWorking time: about 8 hoursWeight: 50gFM receiverSensitivity: