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Alarm Type	Smoke & Carbon Monoxide
Power Source	Hardwired (120V AC) with AA Battery Backup
Sensor	Photoelectric (Smoke) + Electrochemical (CO)
Interconnects	Yes (up to 24 Kidde devices)
Battery	2 x AA Alkaline (included)

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Hardwired Combination Smoke & Carbon Monoxide Alarm with AA Battery Backup

The Kidde 900-CUAR is a hardwired combination smoke and carbon monoxide alarm that protects your family from two of the most serious home hazards in a single device. Operating on 120V AC with two AA backup batteries (included), it delivers continuous detection even during power outages. The photoelectric smoke sensor identifies smoldering fires while the electrochemical sensor detects dangerous CO concentrations from any combustion source. Self-testing components continuously verify the alarm is working properly, and the Hush feature lets you temporarily silence nuisance alarms from cooking or steam. With hardwired interconnect capability for up to 24 Kidde devices, this 85 dB alarm provides whole-home protection backed by a 10-year limited warranty.

Top Features

Dual Sensors: Photoelectric for smoldering fire detection plus electrochemical sensor for carbon monoxide.
Hardwired with AA Battery Backup: 120V AC operation with two replaceable AA batteries (included) for continuous power-outage protection.
Interconnect Capability: Hardwires with up to 24 Kidde devices — when one alarm sounds, they all sound for whole-home alerts.
Self-Testing & Hush Feature: Components continuously verify operation; Hush button temporarily silences nuisance alarms for ~8 minutes.
Three-Color LED Status Indicators: Green = normal, Amber = fault/error, Red = smoke/fire/CO detected, with 85 dB alarm at 10 ft.

Category	Specification
Detection and Sensing
Type	Combination Smoke & Carbon Monoxide Alarm
Smoke Sensor	Photoelectric
CO Sensor	Electrochemical
Sensor Information	Photoelectric sensor detects visible particles from smoldering fires; electrochemical sensor detects carbon monoxide from any combustion source.
Sound Level	85 dB at 10 ft
Smoke Alarm Pattern	3 long beeps, 1.5-second pause, 3 long beeps repeating
CO Alarm Pattern	4 quick beeps repeating every 5 seconds
Features	Self-Testing, Hush (Smart-Hush), Three-Color LED Status, End-of-Life Notification
Power and Interconnectivity
Power Source	Hardwired 120V AC, 60 Hz
Battery Backup	Yes — 2 x AA Alkaline (included)
Battery Replaceable	Yes
Hardwired Interconnectivity	Yes — up to 24 Kidde devices
Interconnect Compatibility	Select Kidde hardwired AC alarms (see User Guide)
Design and Build
Model Number	900-CUAR
Mfr Item Number	21032250
Height	1.93 inches
Width	5.60 inches
Depth	5.60 inches
Weight	0.55 lbs
Color	White
Mounting	Easy-install mounting bracket (4 orientations)
Operating Temperature	40°F to 100°F (4.4°C to 37.8°C)
Humidity Range	10% to 95% RH, non-condensing
Warranty	10-Year Limited
Compliance and Certification
Certifications	UL 2034, UL 217, NFPA 72, NFPA 101, California State Fire Marshal, FHA, HUD
Intended Use	Residential — not designed for RV or boat use

The Kidde 900-CUAR meets the requirements of UL 2034, UL 217, NFPA 72 (Chapter 11, 2002 Edition), NFPA 101 (one and two-family dwellings), the California State Fire Marshal, the Federal Housing Authority (FHA), and Housing and Urban Development (HUD). 10-Year Limited Warranty on the alarm.

Don't know what type of smoke and carbon monoxide alarm is right for your home? Check out our guide on how to choose the right smoke detector for your home.

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In The Box

1 Kidde 900-CUAR Smoke & Carbon Monoxide Alarm
1 Mounting Bracket
1 Hardwire Quick-Connect Harness
2 AA Alkaline Backup Batteries
1 User Guide

Info & Guides

User Manual	Download
Specification Sheet	Download

Kidde 900-CUAR Hardwired Smoke & Carbon Monoxide Alarm with AA Battery Backup, Interconnectable