Superex&reg; Aluminum 8000mAh Dual USB Power Bank Portable Charger External Battery for iPhone, Samsung Its aluminum housing is very durable against accidental dropping. Does not overheat, so it is perfect for putting in your purse or pocket. The power bank has 2USB port to charge smart phones at same time or an iPad at full speed High Capacity, full charge iphone 5s 4 times, full charge Samsung Galaxy S4 2.5 times. It supports over-charged, over-discharged, over-voltage, over-current and short circuit protection, constructed with Li-Polymer Battery assure long life use. Compatible with all smartphones, tablets, MP3 players & cameras including: iPhone, iPad, iPod, Samsung, HTC, Sony, Nexus, LG, Microsoft / Nokia, GoPro, Bluetooth Speakers & many more.