The TORK 2129A 1/2" Conduit Mount Photocontrol Light Sensor provides professional-grade performance for a range of residential and commercial applications. This stem-mounted mechanical photocontrol light sensor automatically detects nightfall, allowing you to run exterior lights from dusk to dawn. Use TORK 2100 series photocontrols to automatically control parking lot and building perimeter lighting or outdoor signage based on ambient light level. The TORK 2129A saves you energy and money, while adding security to your property at night with a time delay feature that prevents car headlights or other stray city lighting from accidentally turning the sensor OFF. The heavy-duty die cast zinc housing is gasketed for additional weather protections and the 1/2" conduit mount is easy to install. Rated for 120/208-277VAC with 190 joules MOV surge protection. When choosing a photocontrol light sensor, trust in the reliable name of TORK, a pioneer in the industry since 1922.