Bluetooth 4.0: With Bluetooth Technology, Listed to music wireless-ly through your phone up to 10M Full High-Def Stereo Sound: Enjoy an impressively crystal clear sound quality and robust bass realized through a 3W audio driver and passive subwoofer. Multifunction : XS Speaker comes with Mic, TF card Support, USB adapter, 3.5mm AUX in port, hands free phone calls. Built-In Battery: Built in rechargeable battery that enables music playback for 3-5 hours.