Features: Multifunctional: Supports wirelessly playing music via BT connection; also supports AUX IN, TF Card / U Disk (supports up to 32GB) music playback and FM radio function. Surround Sound: Dual 3W speakers deliver high performance multi-dimensional sound and an unparalleled cinematic deep bass surround sound; let you enjoy high-quality music freely. Hands-free with Mic: Built-in high definition microphone enables you to receive calls easily and makes your hands free when driving or doing exercise, more convenient and safer. Duration Time: Built-in rechargeable 2400mA Lithium battery supports up to 6 hours of working time. Powered by the Micro USB charge port using the included charging cable. Simple Operation: With big buttons, easy to control power on / off, playing/ pausing, volume +/-, previous / next track, answering / ending / redialing calls and switching modes.