Mini Tough Portable Wireless Bluetooth Speaker Rechargeable with Built-in Microphone Enhanced Bass Boost Handfree aluminum case Full, High-Def Sound: Enjoy an impressively full sound quality and robust bass realized through a 3W audio driver and passive subwoofer. COMPACT AND PORTABLE: Small size and anti-slip sheet included to the bottom of the speaker to add stability. WIRELESS FREEDOM: Built-in mic supports hands-free phone calls & outstanding bluetooth connection range of up to 30 feet for convenient wireless freedom. LONG PLAYING TIME : Up to 8 hours playtime powered by an internal long-lasting rechargeable lithium battery. BROAD COMPATABILITY: Easy Bluetooth connection works with all Bluetooth-enabled devices: smart phones, pads, laptops and desktops, MP3 & DVD players, etc.; 3.5mm audio jack for non-Bluetooth devices.