... .Optional color: blue, purple, black, silver,red 2.Have a power indicator&LED lamp 3.long cycle life,low self ... of short-circuit, over-charge and over-discharge 5. Power bank for mostly digital products, energy storage devices and other electric products ... : aviation aluminum 7. Optional color: blue, purple, black, silver,red Main application fielduniversal usage as stand-by power for cell phone, ...