Get a boost from the sun. Go outside and play but always make sure you've got power with the Boost Solar. This solar-powered backup battery pack features a rechargeable 5000mAh lithium battery for long-lasting reliable power wherever and whenever you need it. Keep walking and talking with the Boost Solar. When the Boost Solar is all charged up, you'll have enough backup power to fully charge most smart phones twice. And with the 2.1A USB out you can also charge your tablet. In addition to charging in the sun, the Boost Solar features a Micro-USB DC input for use with most Smartphone chargers. Use the standard USB port for charging mobile devices. All-weather, all-terrain. The Boost Solar has a rugged rubber exterior and an IPX-4 rating, so it's super sturdy and splash proof for every adventure. And the built-in fastener loops make strapping it on to a backpack a cinch.