Features: Employ advanced digital audio signal processing (DSP) technology and FM modulation phase-locked loop (PLL) to make sound more realistic, more stable performance, long working time, no frequency deviation. LCD display provides more intuitive and accurate view, with low power consumption and minimal noise interference. Built-in 16-bit digital volume adjustment button, easy to use. All the data will not be lost even when power off. Equipped with multiple channels and able to automatically switch. Button operation with backlight. Turn off the backlight for 20 seconds, depending on the camera configuration, the LCD visual effect is better than the actual photo. Application: FM wireless audio, USB PC audio broadcast, wireless microphone, maternal and child care products. Note: Power supply voltage shall not exceed the supply voltage range of this module. Avoid contact with the back of the module while it"s working, so it can function smoothly and prevent short circuit. Avoid local radio transmission frequency to prevent interference affecting transmission range of this module. FM radio works with the transmitter to achieve the desired effect. It"s important to choose a quality radio, because, to a large extent, it will decide the receiving distance and the sound quality. This module needs to be installed in the circuit board, and good wiring is required. Therefore, users must have a good knowledge of electronics. Specifications: Material: PCB Output power: 100mW Audio Frequency Response: 50Hz-18KHz Transmission frequency: 87.0MHz-108.0MHz Modulation modes: standard FM radio Channel: LINE / USB channel (stereo), MIC channel (mono) Equivalent Noise: more than 30dB (sound close to CD quality) Supply voltage: DC 3.0V-5.0V Working Current: 35mA Transmitting antenna: 75cm telescopic antenna Transmission Distance: 75cm standard whip antenna connection, Radio Tecsun PL-660, measured 100 meters of open land. Item Size: 6 * 2.8 * 1cm / 2.36 * 1.1 * 0.39in Item Weight: 12g / 0.42oz Package Weight: 12g / 0.42oz Package Size: 9 * 6 * 2cm / 3.54 * 2.36 * 0.78in Packing List: 1 * Stereo Transmitter Module