This Rock Solid External Battery Pack is the optimum portable power solution for the Tether Boost Core Controller, Case Relay Camera Power System and many other USB devices. Featuring two USB outputs, this external battery is capable of powering two devices simultaneously. The port on the right provides 5V, 2.1A, ideal for the TetherBoost, the Case Relay, iPads and tablets. The left port of 5V, 1A is useful for iPhones, CamRangers, iPods, Android Devices, PSPs, SmartPhones, and many other USB devices. It can power an iPhone 6 for 50 hours or an iPad Air 2 for 20 hours. Thanks to its internal microchip, either port can be used safely by any device. Order this Rock Solid External Battery Pack – a portable power solution built for the professional.