The MXSB-BT03 is a 6w output, wireless speaker, featuring state of the art APT-X 'lossless' audio transfer technology, for that optimum bass sound. Using the latest Bluetooth 4.0 standard, this portable speaker offers an impressive 15hrs of battery life from its inbuilt rechargeable battery, and includes a built in microphone for conference calling, as well as a full range of audio controls. The MXSB-BT03 also comes equipped with a USB charging cable, and a 3.5mm audio cable