KIDDE fire detector - conventional linear motorised beam smoke detector fire beam blue bluetooth, app controlled. ip65, barrier made up of head and reflector, works like an invisible laser beam. if something interrupts the beam the alarm is activated, a single control app. full vds approval (g221060), coverage of 7.5 m to each side from its axis and from 7 to 70 metres of distance between the barrier and the reflective element.