Magnetic surface contact. High security EN50131-2-6 Grade 3. Protected against sabotage by magnetic field. Cable length 2 m. Suitable for mounting on ferromagnetic materials. Permissible distance between 15 and 23 mm in non-ferromagnetic doors and between 8 and 16 mm in ferromagnetic doors. Axially polarized neodymium magnet. Fixing with screws (supplied). Includes plastic housings and spacers for surface mounting. 2 NC contacts (alarm and tamper). Environmental class III, IP67. Operating temperature -25 to 70 ºC. Case size: 54 x 13 x 12.5 mm.