Double Wall Round Construction. Inner Chamber Stainless Steel /Black Anodized Aluminum And Outer Made Out Of Mild Steel Painted In Epoxy Powder Coating. Thermostatic Control . Temp. Range 5Degc Above Ambient To 80Degc +/- 1Degc. Complete With Indicators, Wire Plug. To Work On 220 V . A.C. Without Thermometer.