Mophie juice pack air external rechargeable battery for iphone4 It offers you the full protection of a hard-shell case while providing virtually twice the battery life of the iPhone alone; all in an ultra-thin, light-weight, low-profile design. Features: 1) Virtually double your power 2) Battery and Case all-in-One 3)sync data to PC viaUSB cable from the case 4) Lightweight low-profile design 5) Charge iPhone and extra battery simultaneously 6) Powerful, safe battery cell 7) Four-LED battery charge status and charge progress indicator 8) On/Off switch lets you choose when you want to use the battery’s power 9) OEM or ODM service available 10) Buyer custom OEM packing serivce offered 11)Buyer label service offered Product Dimensions: 5.07 in x 2.51 in x 0.68 in; 2.5 oz 1.Battery Capacity: 1500 mAh 2.Estimated Shipping Weight: 1 lbs 3.Item model number: I701 4.Shipping: This product ships world wide 5.Product Category: Cell Phone External Battery 6.Product Compatibility: Apple iPhone 4, iPhone not included 7.Package Content Included: juice pack air external battery, USB-micro cable, User’s Manual 8.Product Compatibility: Apple iPhone 4, iPhone not included 9. color: black specifications: juice pack air for iPhone 4:Standby Time: Up to 270 hoursTalk Time: Up to 6 hours on 3G | Up to 12 hours on 2GInternet Use: Up to 5 hours on 3G | Up to 9 hours on Wi-FiAudio Playback: Up to 36 hoursVideo Playback: Up to 9 hours