Exterior finish is 304 stainless steel finish with 4 sanitary finish. Interior finish is standard 304 stainless steel. Fully insulated cooking compartment. One power source for controls and elements as well as one ground wire. A positive ground connection is essential. In the OFF position the power is off and the drain valve is open. In the ON position, the power is on ad the drain valve is closed. Time can be set between 1 and 60 minutes. When the time expires, buzzer sounds. Buzzer can be disabledby turning knob to manual position. Timer has no effect on the operation of the steamer. Steam in only generated when required by food being cooked. With no food in the cavity, the unit idles at operating temperature. Check water level light ndicates that the cavity does not have sufficient water. Water can be added through the trough over the door without opening the door, if desired. 4 stainless steel adjustable legs. One year manufacturers warranty. Ava