1. Wireless zero-binding, upgraded to suppress howling, intelligent noise reduction, clear original sound, and better sound quality
2. 2.4G wireless 30-meter transmission, strong anti-interference and no cross-frequency, stable signal and continuous connection
3. Skin-colored microphone, invisible to wear, no fatigue and no pain in the ears after wearing for a long time
4. The amplifier has a built-in large speaker with loud sound.
5. Frequency range: 2400MHz-2483MHz
6. Working distance: 30 meters
7. Battery type: Rechargeable lithium battery
8. Battery capacity: microphone: 300mAh, amplifier: 2200mAh
9. Battery voltage: 3.5V-4.2V
10. Transmit power: 3dbm
11. Receiver sensitivity: -89dbm
12. Transmitter sensitivity: -52+/-3db
13. Signal-to-noise ratio: 90db
14. Duration of use: 8 hours of continuous use (amplifier), 8 hours of continuous use (microphone)
15. Charging time: 1-2 hours
16. Overall dimensions: 57x48x16mm (microphone), tube length 150mm, 98.5x89x40mm (amplifier)
17. Weight: 27.5g (transmitter including headband) 200g (amplifier)

Packing list:
Wireless microphone
Voice amplifier
Double-ended charging cable
Instruction card
Cute stickers
Strap chain (optional)