U99 Mini wireless microphone Wireless headset microphone
UHF one-for-one wireless headset
Frequency range: 610-690Mhz
RF power: 10dBM
Frequency response range: 50Hz-15KHz
Microphone type: capacitor
Battery type: 3.7V lithium battery 390mA
Power input: USB5V / 500mA
Working distance: effective distance 30-40 meters