... control circuit to realize ultra low power. Parameters:Battery cell: 18650 lithium battery*2pcsOutput voltage: 5.05V±0.05Output current: 1A ... can be put in backpack, notebook bag or in the car.Battery indicator: Red, green, blue colorHow to charge the ... diagram as below)Battery indicator: battery capacity 0--30%, blink in red; battery capacity30%--70%, blink in green; battery capacity70%-- 95%, blink ...