INNOMAX Thermal Guardian Quantum Solid State Waterbed Heater, Low Watt State-of-the-art Ultra sensitive electronic control that holds the temperature to 1/8 degree of set point ensures accurate temperature sensing 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 State-of-the-art Ultra sensitive electronic control that holds the temperature to 1/8 degree of set point ensures accurate temperature sensing 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