Patented Mirus field effect detector cells detect disruptions caused by water and fluids, and are not affected by oil or foreign debris. Electronic Switch with no moving parts and totally sealed solid-state electronics, this mercury-free switch never corrodes or jams on debris. Activates/deactivates at 2" and 3/4" fluid levels. Rated to handle pumps up to 20 amps at 12V or 24V DC. Volts 12/24 Amps 20