Advanced BT 5.3 transmission technology, stable connection, no delay. 13mm composite diaphragm, whether it is rock or live, can release a surging sound field and power. In-ear design, comfortable to wear, no discomfort even if worn for a long time. Touch control, just a light press can easily operate. Long battery life, the headset can play music for 4 hours, and the charging Box can be used for a whole day. Colour: Black / White BT version: 5.3 Pairing Name: AP28 PRO Speaker diameter: 13mm Charging interface: Type-C Headset battery capacity: 30mah Charging and battery capacity: 200mah Headset charging time: 30 minutes Charging Box charging time: 1.5 hours Headset battery life: 4 hours Call duration: 5 hours Charging Box can be charged times: 2 times Control method: Touch control Net Weight: 40.8g (1.4oz) Charging Box Size: 53.5*44*24.5mm (2.1*1.7*1in) Packaging Size: 10*8.1*3.1cm (3.9*3.2*1.2in) Packaging weight: 68g (2.4oz)