VISUN&trade; 1900mAh Portable External Power Pack Backup Battery Charger Case with Stylus Pen and Retractable Reel for iPhone 4 4S (Black) VISUN&trade; 1900mAh Backup Battery Case for iphone 4 4S, one switch on/off button for easy operation Compact and lightweight, you can use your iPhone as usual as you use this external battery Built-in 1900mAh high capacity rechargeable Li-Ion battery, can also work as a protective case, 4 LED power indicator Battery itself charged through USB port or USB charging adapter Includes: 1-VISUN&trade; 1900mAh Backup Battery Case, 1-VISUN&trade; USB Cable, 1-VISUN&trade; Stylus Pen, 1-VISUN&trade; Retractable Reel, 1-VISUN&trade; Manual