[Parameter]: Adopts DSP and PLL technology, equivalent noise: ≥30dB; transmitting frequency:76MHz~108MHz, frequency response range: 50Hz~18KHz; blue backlight LCD display, working voltage: DC 3-5V | [Volume]: Built-in 30-level digital volume adjustment, easy to complete with button operation; automatically memorize the volume and frequency before power off | [Input]: This digital FM transmitter support line/USB/MIC audio channel input | [Antenna]: Recommend to connect 75cm standard whip antenna, open area, the measured coverage radius is 100 meters FYR | [Application]: Applied to FM wireless, USB PC broadcast, maternal and child monitoring, wireless microphone,etc