Pack of 2 x Honeywell IS312B Pet Tolerant Passive Infrared (PIR) Motion Detectors

Installation was relatively simple. Difficulties I experienced related to the poor wiring diagram, which did not correlate with my existing Alarm Controller but a call to the supplier of the Alarm clarified that.These can be fixed directly to the wall but you need to leave enough space between the ceiling and the top of the PIR to be able to hinge off the cover. This was not mentioned in the instructions.My only remaining gripe is the very bright LED which is distracting when moving around the room. Its much brighter that the PIR I replaced and whilst it can be switched off it cant be dimmed.