4 Beams IR barrier. Range: Up to 100m outdoor /200 indoor. 4 Frequency channels. Count on a lot of feature from a large selection of options for the installation site. This options offers a considerable flexiblility for differents installation requirements. These charateristics are: Two optical filters and a special sieving circuit offers a real tolerence of 50.000 Lux against natural or artificial light. Anti-crawling.