Digital timers simplify your life by automating repeating parts of your schedule, saving you time, energy and money. The EPC-LC photosensor is an accessory sensor which detects ambient light level and uses that input to switch ON/OFF loads for your electrical automations. This sensor is compatible with ELC SunSet digital timers and has an accurate reading range 0 to 250 foot-candles. The EPC-LC is easy to install with a 1/2" threaded nipple and 180-degree swivel for even greater flexibility. When you need reliable photosensors for your digital time switches, trust in TORK, a pioneer in the electrical industry since 1922.