The Accessory Power Go Groove ENER-G Attaches and extends battery life for your iPhone Sleek, Low-Profile design! Battery life is more than DOUBLED! Well-Designed Sleek Fit and Easy To Use , makes running out of ENER-G close to impossible! The ENER-G Slides onto the back of your phone with an Attractively Constructed Comfort Design! Holds Your iPhone Securely Cushioned Rubber Finish for a Non-Slip Grip! Slim, yet durable, design protects your iPhone from scratches and drops. An Essential Accessory For Every iPhone User An ideal power solution for recreation or business activities. Anytime you are on-the-go, have peace of mind that you won't be left without battery power ! Perfect in urgent and emergency situations . Invest in a product that will never let you down when you need it the most. Compatible with: iPhone 3G and iPhone 3GS The Go Groove ENER-G is the PERFECT Accessory for an ON-THE-GO Lifestyle! BACKED BY AN INDUSTRY LEADING 3 YEAR WARRANTY!