Carrier range: 2.4GHZ
Frequency response range: 20-20KHZ
Transmission delay: 9M/S
Signal-to-noise ratio: 64DB
Input voltage: DC4.8V~5.4V
Charging current: about 65MA
Battery capacity: 70MAH
Working time: about 8H
Charging time: 80MM
Microphone: digital microphone
1pcs:22.5*19.5*5.5cm 0.31kg
50pcs:70*37*27cm 16kg