4 Beams Active IR barrier. Range: 100m. 4 Frequency channels. Double modulation. Advanced model. Thanks to I.A.S.C. and A.T.P.C. functions obtain an beam power self-regulation, adaptating to particular conditions and reducing false alarms due to fog, signal reflections, etc.. Alarm input for alarm retransmission. IP65. Possibility to add a solar battery (SBU-4)(Not included).