features of BT 4.2 + EDR technology, built-in high-grade microphone speaker, hands-free calling function and lightweight design, it is convenient for you to listen to music and answer calls while doing sports or driving, a great companion for your daily life, office time, driving or travel. 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. Long Battery Life: Built-in rechargeable 40mAh Lithium battery lasts up to 2.5 hours of talking time or music playing time and about 1 week of standby time on one full charge. 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. One Button Control: 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.