1. Input method: AUX / TF / Bluetooth / USB
2. Charging input: DC5V / 1.5A
3. Built-in battery: 7.4V / 2000mAh
4. Signal-to-noise ratio: greater than 85db
5. Adjustment method: touch the button + rotary potentiometer
6. FM frequency: 88-108MHz
7. Work instructions: LED
8. Transmission distance: about 10 meters