Would you like to have a mobile power pack to avoid your cell phone running out of power while you are outside? Well， you can have a look at this 1900mAh External Battery Charger for iPhone 4/4SBlack &amp;Green. It adopts top quality material， so you can rest your mind at ease in terms of its durability. 1900mA capacity allows your cell phone to work for quite a long time. With this external battery charger， you can charge iPhone 4/4S anytime and anywhere. At the same time， this mobile source is so portable and lightweight that you can carry it anywhere you go. You deserve to own!                                    Features            Portable and lightweight that you can carry it anywhereHigh quality material ensures its excellent performanceProvide you with a long period of serviceYou can charge your device anytime and anywhereIt is suitable for iPhone 4/4S                                                             Specifications             Battery Type     Lithium-ion batterty     <br> Capacity     1900mAh    <br> Output Voltage     5V    <br> Output  Current     500mA    <br> Cycle Life     500times    <br> Standy Time     Up to 230 hours    <br> Talk Time      Up to 6 hours    <br> Intenet Use     Up to 5.5 hours on 3G                            Up to 8 hours on Wi-Fi    <br> Audio Playback     Up to 30 hours    <br> Video Playback     Up to 8 hours    <br> Dimension     (12.5 x 6.3 x 1.6)cm / (4.92 x 2.36 x 0.59)" (L x W x H)    <br> Weight     124g / 4.37oz      <br> Color     Black & Green    <br> Compatible with     iPhone 4/4S     <br>                                                             Package Includes            1 x External Battery Charger for iPhone 4/4S<br>1 x USB Cable<br>