ids 6 beam ir barrier beam set 60m outdoor wired security alarm microwave beam break alert 4g app monitor alarm notify outdoor alarm monitoring system diy wireless alarm system supports security alarm system wireless photoelectric beam barrier wireless infrared barrier detector solar beam sensor best for outdoor ir break beam sensor solar powered multi beams ir barrier detector solar beam sensor best for outdoor photocell beam sensor simple single solar beam sensor best for outdoor outdoor alarm monitoring system beam blocking rom cctv remote ir break beam sensor solar powered ir break beam sensor solar powered wireless infrared barrier detector solar beam sensor best for outdoor ir break beam sensor solar powered photocell beam sensor simple single ir break beam sensor solar powered outdoor alarm monitoring system ir break beam sensor solar powered photocell beam sensor simple single solar powered wireless perimeter alarm solar beam sensor best for outdoor wireless infrared barrier detector