RE122

The Nanomax wireless sensor is designed to work with GE Interlogix and Qolsys 319.5 wireless systems and features a tiny footprint, external sensor input, 5 year warranty and incredibly long battery life.

The sensor input allows connection of an external magnetic sensor or other normally closed contact so  you can get creative.  When this external input is used it overrides the internal reed switch and magnet so only one or the other can be used.