# Which carbon monoxide detector offers the best value for money under $100? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

Which carbon monoxide detector offers the best value for money under $100?

## Products

### FireAngel FA3322 10 Year Battery Digital Carbon Monoxide Alarm
```yaml
product: fireangel-fa3322-10-year-battery-digital-carbon-monoxide-alarm
brand: FireAngel
price_gbp: 31.61
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
dimensions: 5.08 x 2.99 x 1.22 in
battery_life: 10
display_type: LCD
digital_display: CO levels, temperature, humidity and status messages
alarm_sound_level: 85
```

- **Price:** £31.61 [^1]
- **Summary:** The FireAngel FA3322 is a sealed 10-year carbon monoxide alarm with an electrochemical sensor and colour-coded LCD display. It suits bedrooms, living spaces, caravans and other domestic areas where clear visual alerts and maintenance-free protection are valuable.
- **Ideal For:** It offers strong value under $100 with a 10-year sealed battery, 85 dB alarm, electrochemical sensing and a digital LCD showing CO levels, temperature and humidity.
- **Additional Sources:** [^2], [^3]

### Kidde K5CO Carbon Monoxide Alarm
```yaml
product: kidde-k5co-carbon-monoxide-alarm
brand: Kidde
price_gbp: 13.22
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
dimensions: 5.0 x 2.9 x 1.5 in
display_type: LED indicators
digital_display: false
alarm_sound_level: 85
```

- **Price:** £13.22 [^4]
- **Summary:** The Kidde K5CO is a compact, battery-powered carbon monoxide alarm with an electrochemical sensor, continuous monitoring, test/reset button, and green and red LED status indicators. Its 85 dB alarm, 10-year sensor life, and wall-mount or freestanding installation make it suitable for homes and other indoor living areas.
- **Ideal For:** It offers strong value under $100 with an 85 dB alarm, electrochemical sensor, continuous monitoring, replaceable AA batteries, and a 10-year sensor life at a low purchase price.

---
## References & Sources
[^1]: FireAngel, accessed 2026-08-28. https://www.fireangel.co.uk/products/fa3322-carbon-monoxide-alarm/
[^2]: Fire Detection Shop, accessed 2026-08-28. https://www.firedetectionshop.co.uk/products/fireangel-fa3322-10-year-battery-carbon-monoxide-alarm-w-digital-display
[^3]: Desertcart UK, accessed 2026-08-28. https://www.desertcart.co.uk/products/494129437-fireangel-fa3322-digital-co-alarm-with-10-year-sealed-life
[^4]: Safe Fire Direct, accessed 2026-08-28. https://www.safefiredirect.co.uk/kidde-5co-battery-powered-carbon-monoxide-alarm.aspx