Intermatic EK4536 Electronic Photocontrols Locking Type Ideal for dusk-to-dawn roadway, area and parking lot lighting, floodlights and security lighting Non-drifting silicon light sensor IR filtered for human eye response Zero-cross technology helps device withstand severe in-rush current and extend relay life Exceeds 10,000 operations at full load, to meet life expectancy of LED fixtures CSA certified to both US (UL773) and Canadian (TIL A15) safety standards, RoHS compliant