features advanced BT 4.2 + EDR technology, built-in high-grade microphone speaker, hands-free function and lightweight design. It will offer you amazing experience; you can greatly enjoy your favorite music when doing sports. Features: Wireless Connection: BT 4.2 + EDR technology ensures strong signal and fast transmission, compatible with almost all BT-enabled devices, support connection with two devices simultaneously. 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 keep. Built-in Microphone: High-sensitivity microphone grasps the detail of voice, ideal for in-car calling or working use. Multi-point Technology enables you to switch between your business and personal phones. Easy Operation: Voice prompt function ensures quick and simple operation. One button to control makes it easy to control playing / pausing, answering / ending / rejecting incoming-calls and redialing the last number. Emergency Charging Box: Comes with more than 100mAh emergency charging box, which can be used as a portable power bank and offering emergency power supply to the BT Headphone when in urgent need, keep you enjoying wonderful music all day without any worry for low battery.