Features: [Enhanced Audio] Adopts high-performance ultra-thin diaphragm, with BK chipset, it can deliver crisp treble, natural alto and deep bass. [Wireless BT] With BT 4.1 technology, and supporting HSP, HFP, A2DP and AVRCP profiles, up to 10m effective BT range, you can easily enjoy stereo music wirelessly. [Barrier-free Hands-free Calls] With two 4mm microphones, even when you are listening to music, you can answer hands-free calls easily without any barrier. [Convenient and Easy Operation] Portable and collapsible, you can wear it without constraint; easily put it in your bags. Imitates the raised-dots design of keyboard, and you can operate the headset more conveniently. [Long Standby Time] Built-in a 3.7V 120mAh rechargeable lithium battery, charging it for 2 or 3 hours and the music playing time will be up to 3 hours, call time up to 15 hours, standby time up to 250 hours, so you can enjoy music anywhere and anytime without worries about out of power.