CertificationCE ROHS FCC WEEE UKCA Tiny earbuds convenient to use Touch control double keys operation 13mmcomposite membrane driver element Supoort HIFI sound quality CVC penetrating calling Comfort design for ergonmics Materials is ABS and PC Wireless solution is Jerry AC6976D4 Wireless version is BT 5.1 Wireless support agreement AVRCP HSP HFP A2DP Transmission distance 10m-15m Frequency Response 2.402GHz-2.480GHz Battery capacity 30mAh 300mAh The case of charging times for earbuds is 4times Driver Element is Composite membrane 13mm Frequency Response 20Hz-20kHz Playing time is 5-6h Standby time is 120h Charging time is 1h Color Black white dark green pink blue and support customized Charing port is Micro USB