# What is the most reliable smart smoke detector in the market? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What is the most reliable smart smoke detector in the market?

## Products

### First Alert First Alert SC5 Smart Smoke & Carbon Monoxide Alarm (SC5 Hardwire)
```yaml
product: first-alert-first-alert-sc5-smart-smoke-carbon-monoxide-alarm-sc5-hardwire
brand: First Alert
price_gbp: 97.4
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85
connectivity: App connectivity
carbon_monoxide_detection: 2-in-1 smoke and carbon monoxide alarm
```

- **Price:** £97.4 [^1]
- **Summary:** This is a hardwired 2-in-1 smart smoke and carbon monoxide alarm that sends alerts to your phone and supports voice alerts with Heads-Up warning. It also provides battery backup and can interconnect with compatible alarms to help create a whole-home alert system. It's a fit if you already use or plan to use the First Alert/Google Nest Protect smart home ecosystem and want remote status, testing, and notifications.
- **Ideal For:** If you want the most reliable smart smoke detector, the SC5 Hardwire's Precision Detection Technology and dual sensing (electrochemical and photoelectric) plus hardwired power with battery backup directly target reliable smoke/CO detection and continuous protection.
- **Additional Sources:** [^2], [^3], [^1], [^2], [^3]

---
## References & Sources
[^1]: First Alert Store, accessed 2026-06-23. https://www.firstalertstore.com/store/products/hardwire-smart-smoke-and-carbon-monoxide-alarm-sc5.htm
[^2]: Home Depot, accessed 2026-06-23. https://www.homedepot.com/p/First-Alert-SC5-Hardwire-Smart-Smoke-and-Carbon-Monoxide-Alarm-FSMCO600NVACCL1/337593929
[^3]: First Alert, accessed 2026-06-23. https://www.firstalert.com/products/sc5-hardwire-smart-smoke-carbon-monoxide-alarm