TOOGOO Super Quality External 1900mah Battery Pack Power Station for Apple iPhone 4/4S with Protective Back Cover Go Portable Case Charger for At&t and Verizon (Blue&Black) Output Voltage:5V Output Current:500mA Input Voltage:5V Input Current:&lt;=1000mAh(1A) Work Temperature:-10C~+40C Storage Temperature:-20C~+52C Standby Time:Up to 230 hours Talk Time:Up to 6 hours Audio Playback:Up to 30 hours Video Playback:Up to 8 hours Internet Use:Up to 5 hours on 3G/Up to 8 hours on Wi-fi Dimension:12.5x63x16(mm) Weight:65g.Apple iPod, iPhone, or iPad are registered trademarks of Apple, Inc. Products are Apple compatible and not endorsed by Apple, Inc.