Power Supply: Provides a 18VDC power to low voltage sensors, photocells, and wall stations. Operating voltage of 120/277 VAC, generates 150 mA class 2 power total (80 mA for connected devices) Switches Line Voltage Loads: Switches on/off up to 20A of 120/277 VAC Class 1 line power to connected lighting loads as directed by sensors and/or switch controls. Optimized Switching Timing: Rated to switch fully loaded circuits and utilizes a microprocessor to optimize its switching timing. This ensure a long relay life even when controlling high-inrush LED lighting. Partial Off & Partial On (Dimming): This device provides stepped dimming operation in order to achieve Partial Off & Partial On sequences of operation. Partial Off operation starts with lighting at the full bright level when occupied and drops it to the 50% level during unoccupied periods. With Partial On control, lighting is only allowed to automatically turn on to a 50% level. Once on, an occupant may step lighting to the 100% level by pressing a connected wall switch. A connected occupancy sensor then ensures lights are turned off once the space is unoccupied. Integrated Test / Programming Button: The button on this device allows for instant wiring validation. Upon button press, lighting will toggle off and on to ensure that wiring is correct. LED also blinks a heartbeat to indicate normal operation Quality and Assurance: Proudly made in the USA, 5-year warranty. UL Listed, RoHs Compliant, BAA Compliant, BABA Compliant TAA Compliant, Plenum Rated (UL 2043). SENSORWORX stepped dimming power packs enable partial off and partial on sequences of operation. When in partial off mode, connected lighting is dropped to 50% dim level when occupancy is no longer present, but is never switched off. When in partial on mode, power to the connected lighting load is switched on to the 50% level when signaled by an occupancy sensor. The unit will then raise lighting to the 100% level when a connected switch is pressed. Lighting will turn off if another switch press is detected or when all connected sensors go to their unoccupied state. Additionally, the packs transform incoming line voltage power to Class 2 low voltage as needed by sensor(s) or low voltage switches.