Dakota Digital Electronic Fan Controller has a fully programmable “fan on” and “fan off” temperature (selection range is 150°F - 250°F) to suit any setup. Works with a dedicated temperature sending unit or operates from a sending unit already installed. LED temperature display for simple programming. Key-off run time adjustable from 0-5 minutes. Compatible with single, dual or single two-speed fan applications. 70A relay included, a second relay will be required for dual fan or two speed fan operation, sold separately.