Details: HeatTrak HR-THERM3550 Snow Melting Mats Automatic Thermostat Extension Cable

This thermostat extension cable will automatically turn on your mats when the temperature drops below 35 degrees (F). It's very simple and easy to use. Plug one end directly into any 120V outlet and the other end into your mat's Power Unit. The Thermostat Extension Cable has an LED indicator that illuminates when the thermostat is activated. It will remain activated until the ambient temperature rises above 50 degrees (F).