Feature: 1. The FM transmitter is a miniature radio station, which converts the audio signal into a high-fidelity FM stereo signal and transmits it. 2. The working frequency of the broadcast generator can be set at will, the frequency range is 76‑108Mhz, the power 1W or 7W can be self‑set. 3. Audio+Mic two‑way audio source input, volume can be adjusted, PLL phase‑locked loop frequency synthesis. 4. The working frequency is automatically saved, and it will be automatically set to the working frequency before the last shutdown when the machine is turned on. 5. The kit also includes an antenna, adapter and adapter, easy to use, often used in navigator equipment. Specification: Item Type: Broadcast Transmitter Material: Aluminum alloy Model: ST-7C Frequency Range: 76-108Mhz Frequency Step Value: 100kHz Frequency Stabilization Method: PLL phase-locked loop frequency synthesis Frequency Stability: ±10ppm (-10-60℃) Modulation Frequency Deviation: ≤±75kHz (100%) Working Method: Continuous work RF Output Impedance/Power: 50Ω/1W or 7W (self-settable) Reference Range: Approx. 1-5km / 3280.8-16404.2ft (open ground) Antenna Output Interface: BNC. Package List: 1 x Transmitter1 x Adapter1 x Adapter Cable1 x Antenna1 x User Manual Note: 1. Please do not use over frequency.2. The screen display is blue or white, tiptoe is square or round, and shipped randomly