Back Case External Battery for iPhone 4G 2000mAh black colour Features: • External Battery for iPhone 4G• Colour Available:Black•Easy to take: smart volum and it is very light •Easy to charge: Connect your Iphone to this power station,and use your data cable to connect this station and the computer •Battery type: Lithium-ion batterty •Capacity:2000mAh •Input:5V 1A•Output:5V 0.8A• Tested before shipping and 100% working wellPacking Contains:• 1pcs external battery for iPhone 4G