Multi-functional Audio Input: Supports Bluetooth 5.0 wireless connection, USB/TF card local playback, 3.5mm AUX and RCA wired input, and condenser microphone input, meeting various audio source needs. Dual Power Options: Two power levels, 20mW (short-range stable) and 200mW (long-range coverage), can be set via internal jumpers or switches (subject to the actual product), adapting to different broadcasting ranges. High-Fidelity Stereo Transmission: Uses FM stereo modulation with a stereo separation of ≥45dB and distortion &lt;0.3%, ensuring high-quality broadcasting. Stable and Accurate Frequency: PLL phase-locked loop frequency synthesis technology, frequency range 77-108MHz (covering the global FM band), 100KHz step accuracy, and no frequency drift. Plug and Play, Easy Operation: Works simply by connecting the antenna and power supply; supports simultaneous mixed playback of two audio sources (e.g., AUX + Bluetooth). Operating Voltage: DC 12V (adapter input) Operating Current: Approximately 300mA Transmission Frequency: 77.0 - 108.0 MHz (adjustable, 0.1MHz step) Output Power: 20mW / 200mW (selectable) Modulation Method: FM Stereo Frequency Deviation: ±75KHz Signal-to-Noise Ratio (S/N): > 40dB Frequency Response: 40Hz - 15KHz (±0.2dB) Stereo Separation: ≥ 45dB (5KHz - 15KHz) Total Harmonic Distortion: < 0.3% Input Interfaces: 3.5mm AUX audio interface RCA audio interface Capacitors microphone interface (3.5mm) USB port (supports U disk playback) TF card slot (supports Micro SD card playback) Bluetooth 5.0 (Name: HW-BT) Output Interface: BNC antenna interface (50Ω impedance) Reference Effective Distance: Approximately 50 - 600 meters in open areas (depending on power setting and environment) Color: Black Material: Aluminum Alloy Package Contents: 1*FM Transmitter 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 thin