These models are ideal for flush mounting through suspended or plasterboard ceilings. The operating voltage of this switch is 12 volt a.c. or d.c. 12 volt Version Detection Zone: 360° The time lag (before switch off) is adjustable between 10 seconds and 40 minutes A few PIR switches can be wired in parallel Ideal for retro fitting or new build. Continuous monitoring to ensure lights stay on when area is occupied Designed for mounting through suspended or plasterboard ceilings Time lag: 10 seconds to 40 minutes in 9 steps Photocell range: 100 to 1000 lux and inactive Splash-proof version has additional protection against light splashes and condensation, ideal for bathrooms, shower rooms, etc.