Hi alberto 1, the beam smoke detector monitoring distance are: 1-20 meters;1-40meters;1-70meters;1-100meters. They are choosen based on your room distance 2, now we update the version that no need programmer to program monitoring distance, only need to dial the code on the beam smoke detector directly. I am rella from Asenware ltd, glad to serve you. If you have other problems,contact me whatsapp:008613670150613~
