... ;2441.00Hz Frequency range:2400.00-2483.50MHz Oprating temperature:-20~60C Battery specification:May chargethe lithiumbatterry(3.7V,550mAh,602025 ... the blue lights and flashes.2,Pairing: A:Press the Bluetooth function,device function key,when there is a long bright ... call4,End the call:The call is complited,press the Bluetooth functions keys,which can end the call5,Refuse to answer ...