Portable Case Charger for iPhone 4. Full Cover Protection. Extremely Thin (17 mm). Rubber edges - silicon back (durable and shock resistant). Micro USB charging port. Product Dimensions: 2.5 W x 5.1 L x 0.65 H inches. Talk Time: Up to 6 hours 3G and up to 11 hours on 2G. Internet Time: Up to 5 hours on 3G and up to 8 hours on Wi-Fi. Video Playback: Up to 8 hours. Audio Playback: Up to 32 hours. Power Capacity: 1200 mAh. Input Specs: 5V 500 mA. Output Specs: 5V 500 mA.