If you re looking to route a signal from one Kidde carbon monoxide alarm to the rest of a circuit, there is no better way to accomplish this than with the Kidde CO120X hardwired carbon monoxide relay module. With the Kidde CO120X, you re able to connect and control your auxiliary warning devices in such a manner that a single alarm will alert the entire circuit. If carbon monoxide levels are detected by an alarm in the circuit, the relay system will be notified of the trigger and route the alert to the remainder of your devices around your home or office.