The SWITCHLITE MRE SLD HIBAY recessed PIR Presence/Absence Detector provides automatic control (on/off switching) of lighting loads, with optional manual control. It provides energy saving (on/off switching) in response to room occupancy and daylight levels, controlling incandescent, fluorescent and compact fluorescent lighting, and has the added benefit of being able to connect an external switch. This detector allows flush mounting into a ceiling tile, or surface mounting using a detector back box. The SWITCHLITE MRE SLD HIBAY detector is suitable for HiBay application up to 17 metres.