Zirgos Digital Adjustable Temperature Switch allows you to monitor and control the most remote area of you vehicle. This temperature switch can also be set to monitor the air temperature around the unit. Ideal for monitoring engine compartments glove boxes radio/amp inclosures and much more! The probe may also be used to monitor hard reach areas or even coolant temperature! The ZFSDG now features a heavy duty wire insulator to ensure correct readings throughout the life of the product. The Zirgo(TM) Digital Adjustable Temperature Switch is perfect for engines with an optimal operating temperature greater than 180 degrees. The unit allows you to set the activation temperature from 0 degrees to 225 degrees. Once your programmed temperature is reached the unit will send out a signal to a relay to activate your cooling fan. All Zirgo(TM) accessories come with a limited lifetime warranty.