for iphone 3g,Perfect!

Extended battery for Apple iphone 3G/3GS 1.virtually twice battery 2.protective hardcase 3.sync to PC 4.OEM service juice pack air external battery for iPhone 3G 3GS 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. Product nameRechargeable battery case for iPhone 3G & iPhone 3GSFeature1) Virtually double your power.2) Battery and Case in One3) Charge and sync your iPhone to iTunes without removing it from the juice pack air.4) Intelligent Power Distribution.5) Powerful and Safe Battery Cell Built in overcharge, short-circuit and temperature protection. Latest in lithium .6) Light LED Battery Status Indicator, The integrated LED status indicator tells you exactly how much juice is left in your juice pack air.7) You can use the included USB cable to charge the juice pack air.8) In an ultra-thin, light-weight, low-profile designSpecification1) Product Dimensions: 4.90 in x 2.59 in x 0.75 in; 2.66 oz.2) Battery Capacity: 1200 mAh3) Product Category: Cell Phone External Battery.4) Product Compatibility: Apple iPhone 3G and Apple iPhone 3GS.5) Package Content Included:USB-micro cable,User Manual.6) Colors: black, red,white and purple.7) Color box size:19.5*10.5*2.9CM.8) QTY:100PCS/CTN.9) N.W.:0.04KG10) G.W.:0.18KG11) MOQ:100PCS.iPhone 3GStandby Time: Up to 270 hours.Talk Time: Up to 4.5 hours on 3G | Up to 9 hours on 2G.Internet Use: Up to 4.5 hours on 3G | Up to 5.4 hours on Wi-Fi.Audio Playback: Up to 20 hours.Video Playback: Up to 6 hours.iPhone 3GSStandby Time: Up to 270 hours.Talk Time: Up to 4.5 hours on 3G | Up to 10 hours on 2G.Internet Use: Up to 4.5 hours on 3G | Up to 8 hours on Wi-Fi.Audio Playback: Up to 27 hours.Video Playback: Up to 9 hours.