There is an open button to activate, and see the battery status Input1 / 2: DC5V - 2.0A 9V / 2A Output 1: DC5V - 2.1A (MAX) Output 2: DC5V - 2.1A / 9V-2A / 12V-1.5A (MAX) Output 3: DC5V - 3A / 9V-2A / 12V-1.5A (MAX) Battery: Lithium polymer Battery