The PEM7D is a compact entry and approach warning system for use in shops, reception areas, private homes, etc. It is a self contained photoelectric beam and sensor unit, which works by sending out a beam of infrared light, bouncing it of a reflective disc and receiving it on sensor. If the beam is interrupted i.e. when a person walks through it, an alarm is triggered and an audible warning sound can be heard. The time the alarm is on and the volume or both easily adjusted. Supplied with 12V Adaptor & UK converter.
