CUBEDGE EP01 EDGE Power Battery Case for iPhone 5 - Retail Packaging - Black EDGE.power almost doubles your iPhone battery life with its 2000mAh Li-polymer cell battery Enjoy 8 more hours of talking, 8 more hours of surfing (3G/LTE), 40 more hours of music, or 225 hours more stand by time With just 0.18Lbs, or the weight of 10 US Nickels, EDGE.power can accompany you and your iPhone 5 at any occasion Safe and easy locking system to securely place your iPhone 5 and its LED power indicator allows you to check the battery level at any time You decide when to begin using the iPhone 5 battery life from EDGE.power; Leave it off when you don't need it and turn it on when you need it, or simply keep it on so that it will continue to charge your iPhone 5 even when the phone isn't plugged in