Carbon monoxide detector
Carbon monoxide gives you no warning of its own
Every smoke alarm has a manufacture date printed on the back or the side. That is the clock that matters: the unit is due for replacement ten years from that date, whatever the battery happens to be doing. Testing it takes about two seconds.
What to do
- Press and hold the test button. One long beep means it is working.
- A short chirp every 30 to 60 seconds means the battery is low, not that the alarm has failed.
- Find the manufacture date on the back of the unit.
- Replace the whole alarm ten years from that date.
- Test twice a year - the daylight saving changeover is an easy thing to hang it on.
| Category | Detection & monitoring |
|---|---|
| Where | In-home device |
In an emergency, always call 911.
Also in detection & monitoring
Radon monitor
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Is there one of these near you?
A ResQ‑R badge on one of these carries this same guidance, plus where that particular one is and who looks after it. Point your phone’s camera at the Dalmatian’s spots — no app, no account. See how it works.