Model : A18 Celebrat Supported : HFP, A2DP, AVRCP, SPP, HID Range : <=10 m Best work range : <5m Freq Res : 20Hz~20KHz Battery : 3.7v/300mAh Polymer Lithium Battery Talk time : About 6h (90% Volume) Charging time : about 2.5h Version : V5.0 Working Freq : 2402~2480MHz Sensitivity : -81dBm Max Headset Power : 10mW Speaker type : diameter 40mm/32ohm +-15% Music time : About 8h (70% Vol) Charging input: Micro USB DC 5V 500MA