[Water Warrior 2]

I just plug it into a power point on the bike. That way it can be used on either bike or a cage. Actually looked for the actual price and it was $18 without tax. Not bad for a portable set-up or a permanent set-up if desired. When I get ambitious I will compare the voltage reading with my meter hooked directly to the battery. Not anticipating any voltage drop through the power point wiring that would be of major concern.