These Derale Cooling Products high-amperage adjustable fan controllers are designed to control your electric fan the right way. They feature a finned, die-cast aluminum housing with a bright finish, an automatic resetting circuit breaker, a built-in air conditioning override circuit, wiring, mounting hardware, and instructions. The Derale Cooling Products high-amperage adjustable fan controllers are available for either single or dual fan applications and come with your choice of a push-in or thread-in radiator probe.