INNOMAX Thermal Guardian Touch Temp Solid State Waterbed Heater, Low Watt Convenient to Set and Easy to Read LED Digital Temperature Control with On/Off Button is accurate to 1/8 degree of set point Certified to the standards of the Underwriter's Laboratories (UL) #1445 for Waterbed Heaters Low Watt Solid State Waterbed Heater For Softside Fluid Support Sleep Systems with a Minimum 3 Fill water chamber or tubes Thicker 32-gauge nickel/copper flexible circuitry design with 18-gauge power cord EMF Reduced Circuitry Design Comprehensive 5 year limited warranty Convenient to Set and Easy to Read LED Digital Temperature Control with On/off Button is accurate to 1/8 degree of set point Certified to the standards of the Underwriter's Laboratories (UL) No.1445 for Waterbed Heaters Low Watt Solid State Waterbed Heater For Softside Fluid Support Sleep Systems with a Minimum 3" Fill water chamber or tubes Thicker 32-gauge nickel/copper flexible circuitry design with 18-gauge power cord EMF Reduced Circuitry Design Comprehensive 5 year limited warranty