Including Electrolyzer and Fule Cell: -- Electrolyzer: With input electrical power, it will electrolysis the water into Hydrogen and Oxygen --Fule Cell: Send the Hydrogen and Oxygen to a 25*25mm Proton Exchange Membrane Fuel Cell ( PEMFC ), it will generate electrical power to be shown on the small fan, color disc, ammeter and voltmeter. H2 fuel cell reaction window should face the operator