Polycrystalline Solar Panel Power Bank has a huge 8000mAh Capacity and a USB Output that lets you use the sun's energy to power your phone or MP3 device.Polycrystalline Solar Panel Power Bank.This power bank has been designed to provide power for your iPhone， iPad， iPod and cell phones when there are no power sockets available. Compatible with Nokia， iPhone， iPad， MP3 and MP4 players， consequently when you set off for your next adventure or on your next mission you can but this power bank in your rucksack.Charging your phones couldn't be simpler as this power bank has an USB output so you need to insert the accompanying cable and choosing one of the four connectors that is suited to your phone's charging port. Having a high efficiency of power conversion， this solar power bank even has an electricity-saving function to make certain no damage occurs. This solar power charger is best for camping or outdoor pursuits as it is safe， reliable as well as portable and very practical.