POW1 - EMERGENCY USB BATTERY POWERED POWER BANK COMPACT PORTABLE 4 AA BATTERIES IDEAL FOR SMARTPHONES, TABLETS, MOBILE, APPLE, IPHONE, ANDROID This compact, portable USB power bank allows devices to be charged from 4 AA batteries while on the move. Ideal for smartphones, tablet computers and many other devices Powered by 4 AA batteries Features a battery level indicator (green for alkaline and blue for rechargeable) Power supply: 4 x AA batteries (not supplied) Output voltage: 5Vdc