4 Beams IR barrier. Range: Up to 50m outdoor /100 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. Included tamper, tone status indicator, ACG programme, monitoring jack, response time adjustment and possibility to deactivate one of the beams (Above/Below).