ThermaHeat® manufactures product for the winter convenience of today's RV'er. The 12" X 18" Tank Pad works efficiently up to 40 gallon holding tanks. The tank pads are thermostatically controlled, designed to turn on at 45°F (5° C) and to turn off at 67°F (20° C). Features: Patented construction incorporates a super-efficient Graphene material maximizing heating efficiency and reducing energy consumption. QAI Tested and certified to CSA standards. ThermaHeat® complies with the most recent standards of safety for electric heating appliances, CSA C22.2. ThermaHeat® products are flexible and can be easily and safely applied on curved surfaces. Outside Temperature must be at least 50° F when applying ThermaHeat® products to allow the adhesive to set properly. In order to turn the pads on and off, you will need to install a switch (NOT included) between the battery and the pads. Voltage: 13.5 VDC. Amps: 4.8A. Watts: 65. Lead Wire: 36". Thickness: 3mm.