Fangrui Product Details Part Number:0444 Fan Switch Kit Can Be Used In 12 Or 24 Volt Applications Air Tempreture Application:the Temperature Sensor Is Placed In The Radiator Fin Section As Close To The Hot Coolant Inlet As Possible, It Senses Air Temperature As It Passes Through The Radiator And Has An Adjustable Temperature Range Of 40c To 110c (104f To 230f). Water / Coolant Application:the 0444 Sensor Can Also Be Placed Directly Into The Coolant System And No Need To Cut Hoses. You Will Need To Use A Temperature Sensor Adaptor Kit (part 0409) To Assist With This Type Of Fitment. It Is Recommended To Install The Sensor In The Return Hose From The Radiator. Specification Speed: Single Speed, 10 Second Delay To Start Up The Second Fan Relay Setup: Dual Relay Speed: Single Speed, 10 Second Delay To Start Up The Second Fan Applications: Suitable For Single And Dual Fan Applications Screen Display: Led Digital Temp Display, Actual Temp + Set Temp Temp Display: Centigrade Or Fahrenheit Temp Settings: 40c To 110c (104f