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 Smoke Signal From An Interconnect Smoke Alarm Includes (1) Set of Form C Contacts Power Source Hardwired Product Type Smoke Alarm Relay Module For Use With Kidde Smoke Alarms Manufacturer Warranty Length 1 yr Maximum Operating Temperature 100 Degrees F Minimum Operating Temperature 40 Degrees F Operating Frequency 60 Hz