First Alert 1046884 Smoke and Carbon Monoxide Alarm, Ionization Sensor (Pack of 12)

Sensor Type : Electrochemical, Photoelectric
Power Source : Battery
Color : White
Dimensions : 5.13 In L X 5.13 In W X 1 In H

Sensor Type : Photoelectric
Power Source : Battery
Color : White
Dimensions : 5.25 In L X 5.25 In W X 1.19 In H

Sound Level : 85 DBA
Sensor Type : Ionization
Power Source : Battery
Color : White
Dimensions : 5.6 In L X 5.6 In W X 2 In H

Sensor Type : Ionization, Photoelectric
Power Source : Battery
Dimensions : 5.76 In L X 5.76 In W X 2.47 In H

Sound Level : 85 DBA
Sensor Type : Ionization
Power Source : Battery
Color : White
Dimensions : 5.67 In L X 5.67 In W X 1 In H

Display Type : LED
Sound Level : 85 DB
Sensor Type : Ionization
Power Source : Lithium-Ion Battery
Power Supply : 3 V
Operating Temperature : 40 To 100 Deg F
Color : White
Dimensions : 2.25 In L X 5.7 In W X 5.7 In H
Includes : End Of Life Signal, Smoke Alarm Status LED Indicator And Test/Silence Button