Very unique Book design 16000mAh Dual USB external backup battery for your smart phones, mobile phones, iphone, ipad and tablets and other usb devices like mp3 players, mp4 players & Tablets. Charge two devices at same time through dual USB port. Smart phones and tablets have become the fastest medium of our communication world & necessity of daily living. Stay connected with your dear ones and be updated with your professional life through your smart phones and tablets even during long distance travel. This portable power bank is specially designed to meet your charging needs during outdoors and emergencies. Carrying this PowerBox is easy due to its size and comfortable structure. It features LED Display for charging status and built in intelligent charging, over discharging with short circuit protection facility. This tiny device is completely safe to use as it comes with short circuit protection. So now forget the worries of battery draining issues with your smart phones and tablets as this Portable Power Bank is your savior Compatible with: Most Smart phones, Tablets & 5V Devices like iPhone5, iPhone4/4S, Samsung, SONY, HTC, BlackBerry, iPAD, Digital Cameras, PSP, MP3 & More.