Kidde i12020 120v Ac Basic Smoke Alarm (Replaces 1235) Lot of 4 Replaces Kidde Model: 1235 Wiring: Quick Connect Plug with 8" Pigtails Interconnectable: Up to 24 devices Interconnectable: Up to 24 devices (of which 18 can be initiating) including smoke, CO and heat alarms Audio Alarm: 85dB Temp. Range: 40 100 Degrees Fahrenheit