WRM1080Easy to use with no programming required. Just enter the floor temperature you desire and enjoy. For installations utilizing more than 240 square feet of electric radiant floor heating product, a Master Thermostat with Power Module or a Relay Contactor is also required. Specifications: * Set floor temperature using either fahrenheit or celsius setting * Equipped with ground fault circuit interrupter (GFCI) * Automatically senses both ambient and floor temperature * Available in 15 AMP at 120V and 240V configurations * 3 Year warranty * Width: 3.5"" * Thickness: 1"" * Length: 2.5""