features of Bluetooth technology, built-in high-grade microphone speaker, hands-free calling function and lightweight design, the headphone is convenient for you to listen music and answer calls. A great companion for your daily life, office time, driving or travel. Features: Bluetooth Connection: Bluetooth 4.0 ensures strong signal and wireless connection range is 10 meters (no obstacle). Hands-free with Mic: High-quality Microphone grasps the detail of voice, ideal for in-car calling or working use. Long Battery Life: Built-in rechargeable 55mAh Li-polymer battery lasts up to 2 hours of working time on one full charge. Easy Operation: Easily control playing / pausing, answering / rejecting / ending a call and redialing the last number. Comfortable to Wear: 6g lightweight, in-ear design and ultra-soft earcap provide you long time wearing comfort.