The GRI 290 Series Door Monitors have been designed to monitor access points leading to or from a controlled area, thus preventing doors from being accidentally left open or purposely propped open for extended periods of time. The 290 Series Door Monitors are fully self-contained alarm systems that can be mounted locally or remotely to monitor an access door using a simple closed loop magnetic reed switch. A perfect solution for that single exit door at the end of a long hallway or that isolated doorway everyone seems to forget about.

The GRI 290-1 and 290-2 must be operated with a 12 volt externally supplied DC power source. If installed, the battery will perform a backup function should the external source fail. Both power sources have been designed to maintain a minimum sound pressure level of 85 dB