The Resideo PLS750C1000 Programmable Wall Switch is a professional-grade digital timer designed to automatically control electrical loads using an advanced solar timetable. It adjusts on and off times based on geographic location and seasonal daylight changes, ensuring precise and energy-efficient operation. The switch is commonly used with HVAC-related equipment such as ventilation f... https://www.partshnc.com/pls750c1000-resideo-programmable-switch-white