Flex-a-lite 31163 Variable Speed Control Module with Threaded Temperature Sensor Senses coolant temperature and sets fan speed 60-100 percent for better cooling control Directs fans to run for 30 seconds after vehicle is turned off Reduces charging spikes and current load on charging system Includes 1/4" NPT threaded temp probe with 3/8" and 1/2" thread adapters One year manufacturer warranty