BT 5.1 brings high data transfer speed, stable connection and low power consumption. Automatically pair after taken out from the charging case. 50mAh battery single ear earphone, and charged automatically in the 300mAh charging case; LED power display can know the power status anytime. Built-in high-definition microphone, intelligent noise reduction, delivers clearer and more real talking sound in stereo mode. Multi-functional touch control, support switch songs, phone call, volume control and wake up voice assistant. Lightweight and ergonomic design, fit well to your ear canal and provide you long time wearing comfort. It guarantees stability when doing sports.