Best Smoke & Carbon Monoxide Alarms — Budget + 5 years (2026)
2 smoke & carbon monoxide alarms matching price tier “Budget” + warranty “5 years”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our Kidde 7DCOC Carbon Monoxide Alarm, White vs FireAngel FA6120-INT-T2 Smoke Alarm Detector, White: Which Smoke & Carbon Monoxide Alarms Is Better? guide.
#1 Pick
FireAngel Optical Smoke Alarm 2-Pack — FA6620 10-Year Battery Smoke Alarms for Home with Test/Silence Button, Replacement for FireAngel ST-622/ST-620Rated 4.3 out of 5 stars (12,668)
- Standalone
- 5 years
£22.16
Pros
- Twin pack covers two rooms in one purchase
- Sealed 10-year lithium battery, no replacements needed
- Test/silence button for easy false-alarm hushing
Cons
- Standalone units, no wireless interlink between the two alarms
#2 Pick
Ei Electronics Ei650i Optical Smoke Alarm, WhiteRated 4.6 out of 5 stars (567)
- Standalone
- 5 years
£24.20
Pros
- Continuous self-check reduces false alarms
- Easy to install with test button
- Trusted Ei Electronics/Aico safety brand
Cons
- Standalone unit, no wireless interlink