The Tether Tools Rock Solid External Power Bank is a rechargeable battery power pack designed to power a TetherBoost Core Controller, and charge an iPad, iPhone, iPod, CamRanger, Android, or any USB compatible device. The power bank is equipped with two USB ports, so you can easily charge two devices at once. Use the right port (1A output) for a tablet and the left (500mA output) for a smartphone, iPod or other small USB device. The power bank can be recharged via the included cable. The compact size and high power capacity makes this device well-suited for extended photo shoots and traveling.