spa control system: 1.CE.FCC,ROHS EUROPE and USA STANDARD. 2.110V ... ,6KW features the largest heating thermostat, pre-heating function, temperature display and setting function.2,Surf up to three pumps ... all the settings down memory parameters.9,Fahrenheit and Celsius temperature switch function.10,Water anti-freeze function.11,Backlight ... Power 20W 3) Speaker 8Ωdamp proof speaker spa control system