A MUST HAVE ACCESSORY FOR YOUR ROOF & GUTTER CABLES AND PIPE TRACE CABLES. ALLOWS CABLES TO ONLY OPERATE DURING CONDITIONS WHEN FREEZING MAY OCCUR. - Operates with any 15-amp 120V electrical device. o Works with Nuheat 9PK or 13PK plug-in kits - Turns devices that are plugged into the unit on/off based on ambient temperature o Turns on at approximately 35 degrees F / 2 degrees C (+/- tolerance of a few degrees) o Turns off at approximately 45 degrees F / 7 degrees C (+/- tolerance of a few degrees) - The temperature sensor is built into the unit. The unit DOES NOT sense moisture. - Two receptacle outlets on the front side of the unit. - Does NOT have built-in ground fault protection. - 1-year warranty - UL C/US approved