The mini stereo FM receiving module adopts advanced and PLL technology to high-quality broadcast receiving performance The digital FM transmitter supports line/USB/microphone channel input, the transmission frequency range is 76.0-108.0 MHz, and the frequency response range is 50 Hz to 18 KHz; the frequency adjustment step is short press 0.1 MHz/time, long press 1.0 MHz/Second-rate Onboard 2x3W stereo audio amplifier chip, allowing you to easily DIY FM radio without additional audio amplifier circuit Working voltage:DC 3-5V frequency range:50Hz-18KHz Output power:500mW Colour:Green Material:Metal Package Contents: 2 * radio module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.