HH2 Energy Cells Unlock The Energy Of Water Using 12 Volt Battery Power. On-board Device Creates Live Hydrogen (130 Octane) & Oxygen Gases As A Vehicle Is Driven. HH2 Water Cells Are “The Pollution Solution.” C.a.r.b. Authorized HH2 Water Cells Do Not Affect Factory Warranties Or Alter Or Change EPA Factory Emissions Controls, No Moving Parts, More Mpg, Power & Performance From Pennies Of Water.