Specification :

Frequency range 2.4GHz-2.48GHz
Transmission distance 10M
Environment Working: -20 / + 60 
No Working: -20 / + 60 
Temperature Charging: 0 / + 45 
Operating voltage 3.6V
Operating current d 3.5Ma
Standby current d 2mA
Charging time 2-3H
Talking time e 3H
Standby time 100H