features advanced True Wireless (TWS) BT 4.2 Technology, built-in high-grade microphone and speaker, hands-free function and lightweight design. A great companion for your daily life, office time, driving or travel. Features: TWS BT Design: Wireless dual ear stereo design, left and right ear channel separation. You can use the headset solely, or used them in pairs (stereo mode). Lightweight Invisible: 5g lightweight, mini size and 3 sizes of earcaps provide you long time wearing comfort, and guarantees stability when doing sports. Built-in Microphone: High-sensitivity microphone reduces ambient noises and grasps the detail of voice, ideal for in-car calling or working use. Charging Box: The headphones will be charged automatically in the 350mAh charging box and stop automatically after fully charged. Long Battery Life: 50mAh battery in each headphones ensures 3-4 hours of working time. The charging box enables headset charging for 4-6 times.