Relay Module Features Used to Activate Auxiliary Warning Devices Such As External Bells and Sirens Hallway or Stairway Lighting Will Only Activate When It Receives A CO Signal From An Interconnect Carbon Monoxide Alarm Includes (1) Set of Form C Contacts Power Source Hardwired Product Type Carbon Monoxide Relay Module For Use With Kidde CO Alarms Manufacturer Warranty Length 1 yr Maximum Operating Temperature 100 Degrees F Minimum Operating Temperature 40 Degrees F