Kwikee 143.1021 (903909025) 1-Step Kwikee Automatic Electric Single Step Kwikee 12-volt automatic steps are designed to take the work out of entering or exiting from recreational vehicles Just open the door, the step goes down and locks; close the door, the step goes up and locks An automatic safety stops the extension or retraction if the step meets resistance The engine does not have to be running to activate the step