Intermatic's SMART GUARD Whole House Surge Protective Device provides coverage of your customers big investment equipment, from appliances and computers, to HVAC equipment and TVs. This innovative Surge Protective Device uses the IMODULE with LED lights for quick and easy status indication. A blue light indicates the Surge Protective Device unit is ON and a green light indicates surge protection is active. Trusted, state-of-the-art TPMOV (Thermally Protected Metal Oxide Varistor) surge protection technology eliminates the potentially hazardous failure modes that are commonly associated with standard MOV technology. Type 1 applications include outdoor installations before service entrances and utility meter cabinets. Type 2 applications include installations after service entrances. UL Listed to ANSI/UL 1449 4th edition