BoostSolar with black finish is the solar-powered backup battery pack that will fully charge most smartphones twice and can also charge tablets. This solar-powered backup battery pack features a rechargeable 5000mAh lithium battery for long-lasting reliable power--wherever and whenever you need it. And with the 2.1A USB out you can also charge your tablet. BoostSolar has a rugged rubber exterior and an IPX-4 rating, so it's super sturdy and splashproof--for every adventure. And the built-in fastener loops make strapping it on to a backpack a cinch. Just press the button and the LED charge indicators will let you know how much battery charge you have left. Dimensions: 3/4" x 6" x 6", 11.7 oz.