PNYs PowerPack CC2500 offers the ultimate in compact rechargeable batteries. The ultra-thin credit card design is small enough to keep in your shirt pocket. Whether in your pocket, purse or your backpack, the CC2500 is the perfect accessory for your mobile device. The CC2500 PowerPack delivers enough juice for up to 1 extra charge. Ultra-thin design and ideal for charging your apple, android, windows, and blackberry devices. Free yourself from the wall. Power on the go. Compatible with smartphones & USB charging mobile devices handsets. Manufacturers 2 Year (1 year fabric) guarantee.