Bluetooth version:4.2 + EDR Bluetooth profiles:HSP, HFP, A2DP and AVRCP Bluetooth operating distance:10 meters (equal to 33 feet) Frequency range:2.4-2.48GHz Standby current:10A Working Current:30mA Working voltage:DC 5V Charging current:DC 5 V 500 mA Frequency response:20-20000 Hz Microphone sensitivity:- 40db Built-in battery capacity:250 mAH Charging time (fully charge):Approximate 2-3 hrs Working time:Music time 6 hours, talk time 4 hours Standby time:Approximate 125 hrs DC 5v charging port Micro USB