1000 mAh External Extended Battery Charger for iPhone 4S Keep this small and portable charger around for quick and easy charging of your phone on the go. Advanced lithium-ion technology keeps your iPhone working at optimum performance. Integrated circuitry ensures safe operation and long lasting battery life. The LED battery meter lets you visualize how much power you have left. Recharge the power station the same way you would your phone. Compatible with ALL iPhones and iPods.