Kidde 900-CUAR Hardwired Smoke & CO Detector
- Hardwired 120V AC, 2 AA battery backup included
- Photoelectric smoke and electrochemical CO sensors
- 85-decibel alarm
- Green, amber, red LED status lights
- Interconnectable
- UL 2034, UL217, NFPA72
- 10-Year limited warranty on the alarm
Updated 3 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A hardwired combination smoke and carbon monoxide alarm with battery backup, status lights and a hush button for homes with existing alarm wiring. It is not a standalone battery alarm.
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ASIN: B0BRM3TYJ5Model: 900-CUAR
Overview
Homeowners replacing a hardwired alarm get a single Kidde unit that senses smoldering fire smoke and carbon monoxide, powered by household wiring with batteries as backup. Colored LEDs show normal, fault or alarm status, and a hush button quiets nuisance alarms from cooking or steam.
Two protections in one ceiling spot is the reason to buy, cutting the number of devices on each level. Self-testing and a status light make faults visible without guesswork. The limit is that it needs existing hardwiring, and interconnect compatibility details are thin in the listing.
Who it's for
Homes with existing hardwired alarm circuits that want smoke and CO coverage in one device get a direct replacement. Homes without wiring, or owners wanting voice alerts and sealed batteries, should consider another model.
Pros and cons
- Smoke and CO in one unit
- Battery backup during power outages
- Color LED status lights
- Smart-Hush button for nuisance alarms
- Requires existing hardwiring
- Interconnect partners not described
- Batteries need periodic replacement
- Photoelectric only, no ionization sensor
Performance notes
The photoelectric sensor reacts to visible particles from slow, smoldering fires, while the electrochemical cell measures carbon monoxide separately. Self-testing checks the electronics continuously but does not replace a monthly push test. Placement near bedrooms and on each level decides how early the alarm is heard.
Specifications
| Brand | Kidde |
|---|---|
| Model | 900-CUAR |
| Dimensions & fit | |
| Item Dimensions D X W X H | 1.93"D x 4.95"W x 4.95"H |
| Item Weight | 7.2 ounces |
| Capacity & performance | |
| Upper Temperature Rating | 100 °F |
| Power & efficiency | |
| Power Source | Corded Electric |
| Construction & materials | |
| Color | White |
| Enclosure Material | Plastic |
| Included components | |
| Unit Count | 1 Count |
| Warranty & support | |
| Manufacturer Warranty Description | 10 Year Limited |
| Other details | |
| Alarm | Fire, Smoke, Carbon Monoxide |
| BuiltIn Media | 2 AA Batteries, Alarm, User Guide |
| Item Type Name | Smoke and Carbon Monoxide Alarm |
| Mfr Part Number | 21032253 |
| Operating Humidity | 10% to 95% relative humidity, non condensing |
| Product Style | 6th Edition |
| Sensor Type | Photoelectric, Electrochemical |
Frequently asked questions
How do I install the Kidde 900-CUAR?
It runs on your home's 120V AC wiring with 2 AA batteries as backup, and the included bracket mounts in 4 orientations. Follow the user guide for the wiring connection.
Does the Kidde 900-CUAR work without hardwiring?
No. It is designed to operate through home wiring, with the AA batteries only as backup during a power failure.
How do I silence a false alarm on the Kidde 900-CUAR?
Press the Smart-Hush button, which silences the unit for about 8 minutes.
What do the Kidde 900-CUAR lights mean?
Green means normal operation, amber means an operating error, and red signals smoke, fire or carbon monoxide.
When does the Kidde warranty start?
The 10-year limited warranty on the alarm begins when it is powered on.