Описание:Suitale for all smart system and all 3.5mm audio devices such as Hi-Fi speaker amplifier and so on. - Bluetooth protocol: A2DP HSP HFP OPP OBEX DUN. - Frequency range: 2.4GHZ-2.4835GHZ. - Chip type: original OVC3860. - Battery: 250mAh; charging current: 150mAh; charging time: 2~3H. - Working voltage: 3.3~4.2V; Working current: 3.7V/40mA; Working time: 3~4 hours.