Xtreme XBB8-0142-BLK is a wireless charger and power bank in one. It features a 4000 mAh lithium battery that can fully charge most smartphones in 2-3 hours. It has two charging modes: wireless and wired. In wireless mode, simply place your Qi-compatible smartphone on the power bank to start charging. To activate wired charging mode, connect your device to the power bank's USB output port using your smartphone's charging cable. The device has blue LED indicators that display the charging status.