1800 mAh External Battery Pack Portable Power Bank Case Charger For Apple iPhone 4S iPhone 4-AT&T Sprint and Verizon Simply charge this iPhone Case Charger from your PC or Wall Adapter using the provided USB Cable until it is full; then simply charge your device whenever you need power. Rechargeable Lithium-Ion 1800mah battery pack increases energy efficiency. Great for traveling and long flight - for your iPhone 4 4G Compact size allow easily carry in bags, pant pockets, or shirt pocket 4 LED battery meter displays remaining power level. Material: ABS+ piano finishing