... protecting functions of short-circuit, over-charge and over-discharge 5. Power bank for mostly digital products, energy storage devices and ... : blue, purple, black, silver,red Main application fielduniversal usage as stand-by power for cell phone, smart phone, iphone series products, Bluetoothmusic ... output port.4. When charge for the power bank, do not use it 5. Make sure the charge or output line isn ...