features advanced True Wireless (TWS) BT 4.1 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). Supports True Wireless (TWS) BT 4.1. Lightweight Invisible: 6g lightweight, mini size and 3 sizes of ultra-soft earcaps provide you long time wearing comfort, and guarantees stability when walking, running, climbing, driving, skating, cycling and more. Built-in Microphone: High-sensitivity microphone reduces ambient noises and grasps the detail of voice, ideal for in-car calling or working use. Please note that only one side of earphone is equipped with Mic. Charging Box Power Bank: The headphones will be charged automatically in the charging box and stop automatically after fully charged. 2000mAh charging box can work as a power bank to charge your smart phone, MP3, etc. Long Battery Life: 55mAh rechargeable battery in each headphones ensures about 3 hours of working time, and standby time is up to 120 hours. The charging box enables headset charging for about 20 times.