It has insulated heater jacket which conceals a 121-watt heater and secondary thermostat prevents overheating if primary thermostat fails. Kit uses standard 120 VAC power cord and pulling front strap down and away from unit activates eyewash. LED indicator lights assure proper operation of heaters, green shows the power is ON and amber shows the heaters are in operation. Red indicates the unit has malfunctioned and automatically the unit will shut off.