Magnet detectors are fundamental elements of a perimeter protection system. Large B-4L side-sealed magnet detectors in a metal housing are designed for surface mounting. The metal shielding protects the wiring from damage, making these detectors a perfect solution for locations that are particularly susceptible to sabotage attempts or mechanical impact. These sensors are screwed onto a surface and provide an ideal solution for the installation of garage doors. - Surface mounting (screw mounting) - Robust, metal-sealed housing - Reinforced cable.