MPOW Mbox-Black Ultra Bass Booster Powerful Crystal-Clear Portable Bluetooth Stereo Speaker (Black) Mbox streams incrediable sound with full range output, wonderful bass response and crystal clear articulate high end. Built in high capacity 1500 mAh rechargeable lithium-ion battery, supports up to 10 hours playing time. Portable design, small size(6.3x1.4x1.8 inches), light weight(10.1 oz), Mbox is suitable to tuck into your bag and go. Mbox is precision crafted, with the beautiful aluminum alloy housing and the metal cutting technology, we can easily feel the sleek simplicity. It will be the best partner of your iPhone, iPad, iTouch and more, just like Batman and Robbin. Simply slide the on/off button to "on" position, Mbox is automatically ready for pair. and connect to the last-connected device.