The RM4 is designed to activate an auxiliary device when an alarm is initiated. The RM4 Relay is intended for use with BRK and First Alert Smoke, Heat and Carbon Monoxide Alarms. The relay contacts will activate whenever any interconnected alarm sounds. The relay contacts will automatically deactivate a few seconds after the alarm stops sounding. The RM4 may be wired next to an AC alarm or from a remote location. This relay must be installed in a junction box.

Interconnects smoke alarms, carbon monoxide alarms and heat alarms with:
Lights,Bells,Door Closers,Sirens,Exit Signals,Escape Lights,Exhaust Fans,Other Auxiliary Devices

The BRK CO5120BN is a single or multi-station alarm that senses Carbon Monoxide in your home, office, or other living space. Easy to install, this unit meets building code regulations where AC / DC Carbon Monoxide Alarms are required (separately or in combination with smoke alarms or heat sensors). The CO5120BN is designed to be installed by itself or in a connected system with other alarms or devices. The BRK CO5120BN can be connected to up to 18 devices including other alarms, bells, sirens, repeaters, or strobes to meet ADA regulations if needed. Featuring a advanced electrochemical sensor, an 85db horn, Intelligent Sensing Technology (to avoid nuisance alarms), a 9V backup battery, and a silence feature. Easily prevent vandalism or theft with the locking mounting bracket and battery compartment. Using the Quick Connect wiring harness, installation is quick and completed in a matter of minutes.

SPECS:
Electrochemical Carbon Monoxide Sensor - the most accurate sensor available as compared to other sensing technologies
Single button test/silence
9V Alkaline Battery Backup
Latching alarm indicator - remembers which unit initiated an alarm
Two silence features - can silence the low-battery chirp for up to eight hours or temporarily silence an unwanted nuisance alarm
Intelligent Sensing TechnologyTM  helps reduce the number of nuisance alarms
Dust Cover
Easy Installation/Maintenance - Preferred features include a large opening in the mounting bracket for easy access to wiring. Keyhole slots in the mounting bracket eliminate the need to remove the electrical box screws for installation. A battery pull tab keeps the battery fresh until the home is occupied. Battery installation and removal can occur while the unit is mounted to the ceiling or wall via the side load battery compartment. Two locking features are provided to prevent battery theft and/or theft of the unit. Connection to AC power is made with a "Quick-Connect" wiring harness. Installation is quick, easy and cost effective.
End of Life Signal provides audible notification alarms needs to be replaced
7-Year Limited Warranty
Model # CO5120BN
Weight 6.4 oz
Dimension 5.4" dia x 1.9"H
Operating Voltage 120V AC 60Hz w/ 9V battery backup
Operating Current .09 amps (standby/alarm)
Temperature Range 40F (4°C) to 100°F (38°C)
Humidity Range 10% to 95% relative humidity (RH)
Audio Alarm 85dB at 10 feet
Test/Silence Electronically simulates carbon monoxide condition, causing the unit to alarm. Press and hold test/silence button
Alarm Reset Automatic when CO clears
Interconnections Up to 18 units of First Alert or BRK Smoke, CO and Heat Alarms. Maximum of 12 smoke alarms. See user's manual for details.
Smoke Sensor Electrochemical
Indicator Lights/Sounds
AC Power: Constant Green LED
DC Power: Intermittent Green LED
Local Alarm: Red LED flashes rapidly
Remote Alarm: Red LED out.
Latching Alarm: Red LED flashes every 5 seconds after local alarm stops
Listing Listed to UL2034 Standard

***THIS ALARM HAS BEEN DISCONTINUED BY THE MANUFACTURER***
As of right now there is not a direct replacement for this item - however the CO5120BN is the same item, just without the digital display.

The BRK CO5120PDBN is a 120V hardwired detection unit that is full of features, including BRK's electrochemical Carbon Monoxide sensing technology, a 85db horn, and an end of life alert with a silence button. In case of power failure, the BRK CO5120PDBN has a extra back battery that will provide additional power when needed. To avoid nuissance alarms, the BRK CO5120PDBN incorporates Intelligent Sensing Technology that is specially designed to eliminate annoying premature alarms. SPECS: Electrochemical Carbon Monoxide Sensor - the most accurate sensor available as compared to other sensing technologies LCD digital display with memory Single button test/silence 9V Alkaline Battery Backup Latching alarm indicator - remembers which unit initiated an alarm Two silence features - can silence the low-battery chirp for up to eight hours or temporarily silence an unwanted nuisance alarm Intelligent Sensing TechnologyTM helps reduce the number of nuisance alarms Dust Cover Easy Installation/Maintenance - Preferred features include a large opening in the mounting bracket for easy access to wiring. Keyhole slots in the mounting bracket eliminate the need to remove the electrical box screws for installation. A battery pull tab keeps the battery fresh until the home is occupied. Battery installation and removal can occur while the unit is mounted to the ceiling or wall via the side load battery compartment. Two locking features are provided to prevent battery theft and/or theft of the unit. Connection to AC power is made with a "Quick-Connect" wiring harness. Installation is quick, easy and cost effective. End of Life Signal provides audible notification alarms needs to be replaced 7-Years Limited Warranty Model # CO5120PDBN Weight 7.3 oz Dimension 5.4" dia x 1.9"H Operating Voltage 120V AC 60Hz w/ 9V battery backup Operating Current .09 amps (standby/alarm) Temperature Range 40°F (4°C) to 100°F (38°C) Humidity Range 10% to 95% relative humidity (RH) Audio Alarm 85dB at 10 feet Test/Silence Electronically simulates carbon monoxide condition, causing the unit to alarm. Press and hold test/silence button Alarm Reset Automatic when CO clears Interconnections Up to 18 units of First Alert or BRK Smoke, CO and Heat Alarms. Maximum of 12 smoke alarms. See user's manual for details. Smoke Sensor Electrochemical Indicator Lights/Sounds AC Power: Constant Green LED, Display: blank DC Power: Intermittent Green LED, Display: "bAt" Local Alarm: Red LED flashes rapidly, Display: CO level in PPM Remote Alarm: Red LED out. Display: blank Latching Alarm: Red LED flashes every 5 seconds after local alarm stops Listing Listed to UL2034 Standard