Ensure your fire alarm, supervisory system, or security devices run smoothly with the System Sensor M500M Monitor Module. This durable module is designed for use with your two-wire alarm systems. The address of each module is chosen through the use of built-in rotary decade switches to provide either a two-wire or four-wire fault-tolerant initiating circuit. With this module’s technology, you can detect faults in your fire or security system that may prevent the alarm from going off when it is supposed to, or cause the alarm to go off when there is no emergency. This System Sensor Module has an LED indicator that controls the system panel that facilitates proper functioning. For secure and safe installation, the module should only be connected to the listed compatible system control panels and the connectivity directions should be followed.