What a silent alarm does and does not prove · review
A 3-pack of plug-in alarms with 9V backup and a 7-year warranty, which covers a whole floor plan.
First Alert gives a plug-in alarm with an electrochemical sensor, 85 dB and an end-of-life chirp, in a 3-pack. A 7-year limited warranty applies.
A home CO alarm is built to hold off at low levels: see our UL 2034 page for the alarm windows. A silent alarm does not prove the air is free of CO.
If the alarm sounds, get everyone outside to fresh air and call 911 or the fire department from there. Check the replace-by date, and follow the manual and your local code on where to mount it.
| Power | Plug-in, 9V backup |
|---|---|
| Sensor | Electrochemical |
| Alarm | 85 dB |
| Pack | 3 alarms |
| End of life | Chirp signal |
| Warranty | 7-year limited |
| Amazon reference | B014KEPQLE |
| EAN | 0029054015778 |
The listing says one on each level and in each bedroom. Your local code may set its own rule.
Yes, on the 9V backup.
8.3/ 10
The best way to cover a whole house on a budget.
This model is listed on Amazon.com, at ≈ $71 at the last reading. Listed is not the same as in stock: availability changes daily, and the buy box shows the live price.
Details checked on November 1, 2026.
Covering each level and bedroom at once.
Amazon reports what buyers took in the month before this page was last checked: at least 2,000.
The figure is a floor, rounded by Amazon, — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for wood heating equipment and the matching Amazon product page. Prices, ratings and availability: read on Amazon.com from a New York address. Every figure on this page names its source.
Same shelf, closest price — what the same spend else heats.
2 AA batteries · electrochemical · 85 dB · LEDs · Event Memory · portable
A small AA alarm with Event Memory, which records the last time it detected CO, with 2,356 ratings at 4.7 out of 5.
Best for: A cabin or travel alarm, or a second alarm at home.
≈ $25
plug-in · 9V backup · digital display · 85 dB · 3rd edition
The older Kidde plug-in with a digital display, a 9V backup and 28,356 ratings at 4.7 out of 5.
Best for: A buyer who trusts a long record over a newer model.
≈ $70
10-year battery · backlit display · shows CO and temperature · 85 dB · 6.4 oz
A sealed 10-year alarm with a backlit digital display, the kind of model to put near a stove.
Best for: The alarm nearest a wood stove, where you want to see a number.
≈ $44
The price beside each product is fetched as this page opens, and it is the only figure here that is current. Any amount written into the prose was read once, on the day that sentence was written, and nothing has refreshed it since.
