Features:
Working frequency:  2.4GHZ~2.4835GHZ ISM frequency
Bluetooth criterion: V2.0+EDR
RF output power: -6~+4dBm ( class2 )
RF sensitivity: -75dBm
Effective distance: Maximum without obstacle 10m
Working indication: 2LED(blue & red)
Battery: Rechargeable Li-polymer batteryDC3.7V
Speaking time: about 5 hours
Standby time: about 100hours
Charging time: about 2~3hours
audio frequency output power: (RL=32ohm)2.5mw°
Working temperature: -10°~+45°
Storage temperature:  -20°~+65°
Dimension: 72.5*15*26mm
Weight: 14g