1: The use of advanced digital audio signal processing (DSP) technology and FM modulation phase-locked loop (PLL) to make sound more realistic， more stable performance， long working hours without frequency offset.2: LCD display is more intuitive and accurate， with a very low power consumption and minimal noise interference.3: Built-in 16 digital volume adjustment button operation can be easily completed.4: All the data is automatically power down before the power failure memory of 100 years is not lost.5: multi-channel audio input automatically switchesProduct parameters:Output power: 100mWAudio Frequency Response: 50Hz-18KHzTransmission frequency: 87.0MHz-108.0MHzModulation modes: standard FM radioChannel: LINE / USB channel (stereo)， MIC channel (mono)Equivalent Noise: >30dB (sound close to CD quality)Supply voltage: DC 3.0V-5.0VWorking Current: 35mATransmitting antenna: 75cm telescopic antennaTransmission Distance: 75cm standard whip antenna connection， Radio Tecsun PL-660， measured 100 meters of open land.Size: 26.5x49mmBack when the light (with back light button operation， no key operation automatically turns off the backlight 20 seconds， depending on the camera issue， LCD visual effect than the actual photo is good).Applications: FM wireless audio， USB PC audio broadcasting， wireless microphones， maternal and child care.Package Contents:1x Multifunction FM Stereo Transmitter Module