Here at Energenie we know how annoying it is to run out of battery when you're on the go, now with the ChargeSleeve for iPhone4 that no longer has to be a problem! As Energenie presents its new iPhone4 ChargeSleeve, this product slides on to the back of your iPhone and recharges it. It has a 1, 8 00mAh battery which allows for a full recharge of your iPhone. The product comes with a USB to MicroUSB cable to recharge your ChargeSleeve.