KIDDE long-range reflector kit barrier 5-120 m, for reflective beam detector, barrier from 5 to 120 m: - from 5 to 50 m with the detector alone. - from 50 to 120 m with the detector and the long-range kit., automatic alignment., simply point the laser at the reflector and, with just the press of a switch, it aligns itself., all operations can be carried out by one person.