Polycrystalline Solar Panel Powered Back Up Battery USB Charger lets you use the sun went out and about to charge your device plus it has a 4000mAh Battery Capacity.Polycrystalline Solar Panel Powered Back Up Battery USB Charger.Designed to provide power for your iPhone， iPad， iPod and mobile phones when there are no power sockets available， this solar power bank is the solution to your charging worries. It is also compatible with Nokia， iPhone， iPad， MP3， MP4， and other mobile phones too， so when you head to the hills on your next mission you can but this power bank in your bag.The USB output provides convenience for charging your phones by simply inserting the accompanying cable and selecting one of the four connectors that matches your phone's charging port. This solar charger has a high efficiency of power conversion and also an electricity-saving function to make sure no damage occurs. Portable， practical and long cycle life， this solar power charger is ideal for camping or outdoor pursuits as it is safe and reliable.