Specifications:

Battery-3.7V 280mAh LI-Pol
Speaker-3Ω/ 1W
Talking time -UP to 6 hours
Standby time -UP to 200 hours
Charging time -Less than 2 hours
Charging voltage-5V DC (USB)
Frequency Range-2402Mhz-2480Mhz
Operation tempreture-10-50℃
Storage tempreture-20-70℃
Bluetooth version-BT2.1+EDR
Supported profile-HSP, HFP