features of BT 4.1 Technology, built-in high-grade microphone speaker, hands-free calling function and lightweight design, it's convenient for you to listen music and answer calls while doing sports or driving. A great companion for your daily life, office time, driving or travel. Features: [BT Connection] BT 4.1 technology ensures strong signal and fast transmission, and offers high-fidelity stereo music. Compatible with iOS / Android / Windows Smart phones and other BT-enabled devices. [Lightweight and Invisible] The BT headset with 4g lightweight, super mini size and ultra-soft earcap provide you long time wearing comfort, and guarantee 100% stable. Easy to use and custody. [Built-in High-quality Microphone] High-sensitivity microphone grasps the detail of voice, ideal for in-car calling or working use. Integrated Multi-point Technology enables you to switch between your business and personal phones. [Duration Time] Built-in rechargeable 60mAh Lithium battery lasts up to 10 hours of talking time or 6 hours of music playing time and 480 hours of Standby Time on one full charge. [Easy Operation] Simple operation, easily control playing / pausing, answering / ending an incoming call and redialing the last number. With voice prompt function, very convenient to use.