Certification CE FCC ROHS Tiny earbuds convenient to use Touch control double keys operation 6mm composite membrane driver element Supoort HIFI sound quality CVC penetrating calling Comfort design for ergonmics Materials is ABS+PC Wireless solution is AC6973D Wireless version is BT 5.0 Wireless support agreement is A2DP Transmission distance is 10m-15m Frequency Response is 2.402GHz-2.480GHz Battery capacity is 30mAh / 300mAh The case of charging times for earbuds is 4times Driver Element is Composite membrane 6mm Frequency Response is 20Hz-20kHz Playing time is 4-5h Standby time is 120h Charging time is 1h Color Black white pink and support customized