Two built in microphones with ENC Built in Hall switch open the lid of case with automatic connection 6mm composite membrane driver element Supoort HIFI sound quality CVC penetrating calling penetrating calling Comfort design for ergonmics Built-in button cells,with long battery life and safe working Waterproof IPX5 Materials is ABS and PC Wireless solution is RTL8753 Wireless version is BT 5.0 Wireless support agreement AVRCP HSP HFP A2DP Transmission distance is 10m-15m Frequency Response is 2.402GHz-2.480GHz Battery capacity 60mAh 500mAh with protective IC board The case of charging times for earbuds is 4 times Microphone sensitivity -38±3dB Impedance 16±15 Driver Element is 6mm Composite membrane speaker Frequency Response is 20Hz-20kHz Impedance output sensitivity is 97±5dB at 1KHz Input DC5V 500mA Playing time 5-6h Standby time 200h Charging time 1.5h Color Black and support customized