ASiNG S16 2.4G Wireless Voice Amplifier with Headset Microphone for Teachers Tour Guides Without Strap Chain

1. Wireless zero-binding, upgraded to suppress howling, intelligent noise reduction, clear original sound, and better sound quality2. 2.4G wireless 30-meter transmission, strong anti-interference and no cross-frequency, stable signal and continuous connection3. Skin-colored microphone, invisible to wear, no fatigue and no pain in the ears after wearing for a long time4. The amplifier has a built-in large speaker with loud sound.5. Frequency range: 2400MHz-2483MHz6. Working distance: 30 meters7. Battery type: Rechargeable lithium battery8. Battery capacity: microphone: 300mAh, amplifier: 2200mAh9. Battery voltage: 3.5V-4.2V10. Transmit power: 3dbm11. Receiver sensitivity: -89dbm12. Transmitter sensitivity: -52+/-3db13. Signal-to-noise ratio: 90db14. Duration of use: 8 hours of continuous use (amplifier), 8 hours of continuous use (microphone)15. Charging time: 1-2 hours16. Overall dimensions: 57x48x16mm (microphone), tube length 150mm, 98.5x89x40mm (amplifier)17. Weight: 27.5g (transmitter including headband) 200g (amplifier)Packing list:Wireless microphoneVoice amplifierDouble-ended charging cableInstruction cardCute stickersStrap chain (optional)