The N505AU-M from Nascom is a surface mount man door magnet, silver. The N505AU FLIP SWITCH is perfect for man doors. The unique flip option allows the switch to be mounted with the cable in either direction, without loss of gap. The FLIP SWITCH combines the installers' choice of contact configuration with an N35 NdFeB magnet for maximum gap performance. NO DEAD SPOT technology, in the N505AU closed loop versions, prevent false alarms caused by door misalignment.