features advanced True Wireless (TWS) BT 4.1+EDR 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 Left and Right ear headset solely (single track mode), or use in pairs (stereo mode). Lightweight Invisible: 5g lightweight, mini size and 3 pairs of eartips 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: Turn the power switch of the charging box to ON, then the headphones can be charged in the 450mAh charging box. Long Battery Life: 45mAh battery in each headphone ensures 3-4 hours of working time. The earphone and the charging case can be fully charged in 1-2 hours.