# Which smart smoke detector offers the best value for money? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

Which smart smoke detector offers the best value for money?

## Products

### First Alert SC5 Hardwired Smart Smoke and Carbon Monoxide Alarm FSMCO600NVACCL1
```yaml
product: first-alert-sc5-hardwired-smart-smoke-and-carbon-monoxide-alarm-fsmco600nvaccl1
brand: First Alert
price_gbp: 96.83
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85dB at 10 feet
connectivity: WiFi
carbon_monoxide_detection: Electrochemical
```

- **Price:** £96.83 [^1]
- **Summary:** The SC5 is a hardwired smart 2-in-1 smoke and CO alarm with WiFi connectivity, voice alerts, app notifications, interconnect capability and battery backup. It uses Precision Detection technology and an electrochemical CO sensor, is compatible as a Nest Protect replacement, and includes a quick-connect plug for easy installation. It suits homeowners wanting a connected replacement for Nest Protect with app alerts and whole-home interconnect.
- **Ideal For:** Ideal for value-minded buyers because it combines hardwired power with WiFi smart alerts, electrochemical CO sensing, and an 85dB alarm for 129.99 USD price-level competitiveness.
- **Additional Sources:** [^2], [^3], [^1], [^2], [^3]

### First Alert Z-Wave Plus Smart Smoke and Carbon Monoxide Alarm (Works with Ring)
```yaml
product: first-alert-z-wave-plus-smart-smoke-and-carbon-monoxide-alarm-works-with-ring
brand: First Alert
price_gbp: null
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85 dB at 10 ft
connectivity: Z-Wave Plus
temperature_range: 40 °F to 100 °F; 4 °C to 38 °C
carbon_monoxide_detection: Electrochemical
```

- **Price:** £None [^4]
- **Summary:** Combination photoelectric smoke and electrochemical CO sensor with Z-Wave Plus connectivity for Ring and other Z-Wave systems, tamper-resistant mounting, and replaceable AA batteries. Suited for homes that need a battery-powered, networked smoke/CO solution where hardwiring isn't available.
- **Ideal For:** Suitable for value-conscious buyers because it provides Z-Wave Plus smart integration and both smoke and electrochemical CO sensing with an 85 dB alarm and replaceable AA batteries.
- **Additional Sources:** [^5], [^6], [^4], [^5], [^6]

### Google Nest Protect (Battery)
```yaml
product: google-nest-protect-battery
brand: Google
price_gbp: 117.95
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85 dB at 10 ft (3 m)
battery_life: 10
connectivity: Wi‑Fi 802.11b/g/n 2.4 GHz; Wireless Interconnect 802.15.4 2.4 GHz; Bluetooth Low Energy (BLE)
temperature_range: Operating 40° to 100°F (4.4° to 38.8°C)
carbon_monoxide_detection: Yes (electrochemical CO sensor, 10‑year)
```

- **Price:** £117.95 [^7]
- **Summary:** Nest Protect (Battery) is a combined smart smoke and carbon monoxide alarm with split‑spectrum smoke sensing, a 10‑year CO sensor, voice alerts, Pathlight, and Wi‑Fi plus wireless interconnect for whole‑home alerts. It suits users who want smartphone notifications, automated self‑tests, and easy installation without hardwiring.
- **Ideal For:** Good value for money for buyers who want long sensor life and smart alerts-its 10‑year CO sensor and Wi‑Fi interconnect provide durable, remotely monitored protection.
- **Additional Sources:** [^8], [^7], [^8]

### Kidde Smart Smoke and Carbon Monoxide Alarm P4010ACSCO-WF
```yaml
product: kidde-smart-smoke-and-carbon-monoxide-alarm-p4010acsco-wf
brand: Kidde
price_gbp: 67.04
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85
battery_life: 10
connectivity: Wi-Fi 802.11b/g/n (2.4GHz)
temperature_range: 40 to 100F / 4.4 to 37.8C
carbon_monoxide_detection: Electrochemical sensor
```

- **Price:** £67.04 [^9]
- **Summary:** The Kidde P4010ACSCO-WF is a hardwired combination smoke and CO alarm with Wi‑Fi smart features, mobile notifications, voice alerts, and a sealed 10‑year lithium backup battery. It uses a photoelectric smoke sensor and electrochemical CO sensor, supports Kidde app control and smart hush, and is designed to interconnect with existing Kidde hardwired alarms. It suits homeowners wanting wired smart detection with long-life backup and app notifications.
- **Ideal For:** Good value for money because it combines Wi‑Fi notifications, 10‑year sealed battery, 85 dB alarm, and both photoelectric smoke plus electrochemical CO sensors in a single hardwired unit.
- **Additional Sources:** [^10], [^11], [^9], [^10], [^11]

### X-Sense XS01-WT Wi-Fi Smoke Alarm
```yaml
product: x-sense-xs01-wt-wi-fi-smoke-alarm
brand: X-Sense
price_gbp: 29.8
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
alarm_volume: 85
battery_life: 1
connectivity: Wi-Fi (2.4 GHz)
carbon_monoxide_detection: false
```

- **Price:** £29.8 [^12]
- **Summary:** Compact photoelectric Wi‑Fi smoke alarm with app notifications and remote monitoring via the Tuya/Smart Life platform. Runs on a replaceable CR123A lithium battery rated for about one year and is suited to users who want a low-cost smart smoke alarm without CO detection or voice‑assistant integration.
- **Ideal For:** Good value for money because it provides Wi‑Fi remote alerts, a photoelectric sensor, and a loud 85 dB alarm while costing far less than premium smart detectors.
- **Additional Sources:** [^13], [^12], [^13]

---
## References & Sources
[^1]: First Alert Store, accessed 2026-06-16. https://www.firstalert.com/products/sc5-hardwire-smart-smoke-carbon-monoxide-alarm
[^2]: First Alert Store (alternate listing), accessed 2026-06-16. https://www.firstalertstore.com/store/products/hardwire-smart-and-carbon-monoxide-alarm-sc5.htm
[^3]: Best Buy, accessed 2026-06-16. https://www.bestbuy.com/product/first-alert-smoke-and-carbon-monoxide-detector-hardwired-white/JJ8Z8VQ4FT
[^4]: First Alert Store, accessed 2026-06-16. https://www.firstalertstore.com/store/products/z-wave-smoke-and-carbon-monoxide-alarm-zcombo-g.htm
[^5]: BRK Electronics, accessed 2026-06-16. https://www.brkelectronics.com/products/zcombo-z-wave-enabled-battery-smoke-co-combo-alarm
[^6]: LinkdHome (review with product links), accessed 2026-06-16. https://linkdhome.com/articles/first-alert-z-wave-smoke-detector-review
[^7]: Lowe's, accessed 2026-06-16. https://www.lowes.com/pd/Google-Nest-Protect-Battery-Operated-Smart-Combination-Smoke-and-Carbon-Monoxide-Detector/1001086370
[^8]: Smart Home Compared, accessed 2026-06-16. https://smarthomecompared.com/smoke-alarms/google-nest-protect-battery
[^9]: Kidde (official), accessed 2026-06-16. https://www.kidde.com/products/smart/smoke-and-carbon-monoxide-alarm-with-smart-features
[^10]: FBI Security (Fried Brothers), accessed 2026-06-16. https://fbisecurity.com/kidde-p4010acsco-wf-smoke-carbon-monoxide-alarm-w-smart-features.html
[^11]: Consumer Reports (listing shows price), accessed 2026-06-16. https://www.consumerreports.org/home-garden/smoke-carbon-monoxide-detectors/kidde-p4010acsco-wf/m405453/
[^12]: X-Sense store, accessed 2026-06-16. https://www.x-sense.com/products/x-sense-xs01-wt-wi-fi-smoke-alarm
[^13]: TechHive (listed retailer price), accessed 2026-06-16. https://www.techhive.com/article/579309/x-sense-xs01-wt-wi-fi-smoke-alarm-review.html