Features: Advanced BT Technology: Wireless BT 4.1 Technology ensures transmitting strong signal in high quality and high speed and offering high-fidelity stereo music. Hands-free with Mic: Hands-free call helps your avoid the danger when driving. With multi-point connection, you can seamlessly switch between your business and personal phones. Simple Operation: Simple operation, easily control playing / pausing music, answering / rejecting / ending an incoming-call and redialing the last number. Duration Time: With built-in 30mAh Li-battery, it provides 3.5 hours of talking time and 3.5 hours of music time and the standby time can last to 55 hours. Mini and Invisible: Super mini size, invisible and 5g lightweight design is suitable for working, driving, running, climbing and more.