SPECIFICATION: · Compatible with iPhone 4/ 4s · Built-in Battery Capacity: 2300mAh · Material: Front Pack: full grain leather Back Case: ABS and PVC material · Design: It is smart and stylish design.The front pack with logo "BXT" can protect your iPhone effectively, the back pack adopts butterfly shape with antiskid function,the power case also could be used for a cell phone case,it is designed with stand kit , it can free your hands when watch video.What"s in the Box: · One power case · One charging cable · One user manual Buy with Confidence: · Dispatched Via USPS/Roymail/UPS/DHL Tracked · 7*24 Tech. and E-mail Support · 100% Satisfaction Guaranteed · Perfect after-sales service Guaranteed Please Note: · Please read the entire manual carefully before using the battery case.