Stereo Bluetooth Wireless Portable Super Bass Mini Speaker GK-S11 FM USB TF Card Support TF card Bluetooth handsfree Version Blurtooth 4.0 Audio transmission distance up to 10 meters , support ipad and all cellphones supporting bluetooth.Powered by USB cable or built-in lithium battery ( about 5hrs play time) Hi-fi sound output, good performance in bass sound system, The data transmission can reach 2.1Mbps Playing Time 10 hours