Highlights: Protect your iPhone from scratches, dust & minor bumps with the tough & durable case Extend your Apple iPhone battery life with the built-in battery charger Also listen to your favorite music with the on-board stereo speakers Compatible with iPhone 2G, 3G, 3GS only Specification: Dimensions: 5.51 in x 2.76 in x 1.18 in Weight: 2.8 oz Capacity: 1800m Ah Battery: Li-ion polymer battery, 1800m Ah Certifications: CE, FCCAudio Watt: 1 W Working Temperature: 0 to 55 Degrees