1. Bluetooth wireless transmission, more convenient to use 2. Thin and light, compact, 158 grams, thickness of 3.9 cm or so 3. High-fidelity microphone, double-layer PVC line, strong resistance to pulling, good shielding 4. Frequency intelligent amplifier system: in the radio state, the amplifier automatically turns into AB class anti-interference amplification mode; in other modes, the amplifier turns into D class power-saving mode 5. Support MP3 WMA WAV lossless format 6. Support 32GB TF card expansion FM radio station radio (TF card not included) 7. One-touch recording and playback (please insert a wired microphone for recording) 8. Note: The model to achieve the wireless function, you need to buy a wireless microphone separately. Parameters: 1. Basic functions: music radio microphone 2. Material process: UV process + ABS plastic 3. Rated power: 5W 4. Separation: 80dB 5. Distortion: 1% (3.7V, 1KHz, 1W) 6. Signal to noise ratio: 83dB 7. Working voltage: DC3.7V 8. Charging voltage: DC5V 9. Li-ion battery capacity: 2200mAH 10. Impedance: 2 11. Display: LED display 12. Speaker: 2.5 inches x 1 13. Audio format: MP3 WMA WAV 14. Firmware upgrade: Yes 15. Machine volume: 85mmX39mX117mm 16. Working temperature: -5-40 degrees Celsius Package includes: 1 x audio speaker 1 x wired headset microphone 1 x waistband 1 x usb data cable 1 x instruction manual