1.TWS BLUETOOTH 5.4: TWS 5.4 chip earbuds bluetooth technology to ensure the most stable connectivity, fast transmission without signal loss or music dropouts. Built-in Mic, perfect for hands- phone calling, sport, working or listen to music that provides the wonderful stereo call & audio quality and clarity. 2.LONG TIME USE: Get up to 4.5 hours of listening time when using the earbuds, and the charging case can recharge the earbuds up to 3 times for a total listening time of up to 20 hours. Music time about 4.5 hours (80% volume), call time about 3 hours (80% volume), headphone standby time 60 hours and charging box battery full time need 1.2 hours. 3.SEMI-IN-EAR DESIGN: Non-destructive high-definition sound quality, comfortable wearing fell, easily grasp the answering call and muisc play/switching, without delay continuous lines. 4.DURABLE FEATURES: Both Earbuds and the Charging Case are IPX5 dust, sweat, and water resistant, high -definition sound quality, comfortable wearing feel, easily grasp the answering call and music play/switching, without delay continuous lines. 5.HIGHER LEVEL OF CONTROL: Manage playback functions from the stem with touch control. Swipe up or down to adjust volume, press to play and pause music or mute and unmute yourself on calls, and press twice to end calls. And hold the stem to switch between listening modes.