Brand: Flex-a-lite Manufacturer's Part Number: 33055 Part Type: Fan Switches Product Line: Flex-A-Lite Variable Speed Controllers Summit Racing Part Number: FLX-107000 UPC: 088657330558 Thermal Switch Style: Fan control kit Sending Unit Style: Radiator probe Sending Unit Included: Yes Fan Quantity: Dual Adjustment Range (degrees F): 160-240 degrees F Relay Included: No Wiring Harness Included: No Manual Override Switch Included: No Air Conditioning Relay Included: No Quantity: Sold as a kit. Notes: For use on 12 volt systems. Variable temperature controller and probe for 280/282/290 and 270 series "monster" fans. Rated 45 amps. Flex-A-Lite Variable Speed Controllers Flex-A-Lite variable speed controllers attach on or near the electric fan， sensing coolant temperature via a radiator probe or temperature sending unit. They set fan speed from 60 to 100 percent， depending on the built-in thermostat's setting. The thermostats have a range of 160 to 220 degrees F. The variable speed controllers allow greater control over engine temperature， which helps to reduce charging spikes and current load on the charging system. They will keep the fans running for 30 seconds after your vehicle is turned off.