Solio Xcellerator and HUB Battery Pack, Black/White The Xcellerator is designed to deliver a rapid charge even in low light conditions Powers USB-rechargeable devices such as smartphones, tablets, e-readers, GPS watches, cameras, water purifiers, bike lights, headlamps, lanterns Special output mode is optimized for Apple products; A standard output model is CTIA optimized for most other devices following the USB protocol Simple, fast-charging of the 2000 mAh lithium-ion battery stores solar energy for up to 1 year Easy-to-operate charger can be powered up from either solar energy or, when the sun goes down, from any USB port or charger