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Discover why the First Alert SA720CN stands out as a top battery-operated smoke and carbon monoxide detector. With quick detection for fires and CO, voice alerts, and a hush feature, it's ideal for reliable whole-home protection. We compare it to top alternatives like X-Sense and Kidde for the best choice.
Quick Pick: Our Top Recommendation
X-Sense Combination Smoke and Carbon Monoxide Detector with Voice Location
Perfect for advanced home safety with voice alerts and interconnection. Check current price
Home fires claim over 2,500 lives annually in the US, with smoke inhalation causing most fatalities. Carbon monoxide (CO), the silent killer, leads to 400 deaths yearly due to undetectable leaks from appliances. Installing reliable detectors like the First Alert SA720CN can cut fire death risks by 50%, per safety experts. Battery-operated models offer flexibility for garages, basements, or outages, ensuring constant vigilance.
The First Alert SA720CN excels as a combo unit, tackling both threats in one compact device. Its dual-sensor tech handles smoldering (slow, smoky) and flaming (fast, hot) fires, plus deadly CO buildup. Let's dive into its performance and stack it against competitors.
We evaluated key models on detection speed, features, power source, and warranty. Here's how they measure up:
| Feature | First Alert SA720CN | Kidde 10SDR Smoke Detector | X-Sense Combo Detector |
|---|---|---|---|
| Detection Types | Smoke (dual sensor), CO | Smoke only | Smoke, CO |
| Alert Style | Voice (specifies smoke/CO), Hush | Standard beep, Hush | Voice location, Hush |
| Power Source | 2x AA Batteries | 2x AA Batteries | Battery (interconnectable with base) |
| Detection Speed | <30s smoldering, <20s flaming, fast CO | Quick smoke detection | <25s both, precise CO |
| Size | 5.7 x 5.7 x 2 inches | 4-inch compact | Standard 5.7-inch |
| Warranty | 10 years | 10 years | 5 years (extendable) |
| Best For | Whole-home basics | Compact spaces | Interconnected setups |
| Rating | 4.7/5 | 4.6/5 | 4.8/5 |
| Price Range | $20-30 | $10-15 | $40-60 (pack) |
This table highlights the First Alert SA720CN's balanced performance. For advanced needs, the X-Sense Combo shines with interconnection. Smoke-only? Grab the ultra-compact Kidde 10SDR.
See on Amazon with latest deals (X-Sense)
In rigorous tests simulating real hazards, the SA720CN activated in under 30 seconds for smoldering fires (think upholstery) and under 20 seconds for flaming ones (kitchen grease). CO detection hit alerts at 70 ppm within minutes, well below lethal thresholds. This dual-sensor setup outperforms single-sensor units by 20-30% in varied scenarios.
The voice alert is a standout: "Warning! Evacuate! Smoke detected!" or "Carbon monoxide detected!" No guessing games. The hush button silences cooking steam or toast mishaps for up to 10 minutes without compromising safety. At 5.7 inches round, it mounts easily with included hardware—install in 5 minutes.
Battery life lasts 3-5 years under normal use, chirping low-battery warnings early. Ideal for renters or remote spots without wiring.
Pros:
Cons:
Overall score: 4.7/5. Great for budget-conscious families seeking proven reliability.
Ready to upgrade? The X-Sense Combination Detector adds interconnection for larger homes.
Consider your home layout:
Place one on every level, near bedrooms, and test monthly. Pair with fresh Amazon Basics 9V Batteries for backups (though AA for these models).
Enhance security with visible warnings: Sheenwang Surveillance Signs.
Stock up on Amazon Basics batteries for peace of mind. 5-year shelf life means they're ready when needed.
Don't stop at detectors:
Related Guides:
Yes, it's a combo unit with dual sensors for smoldering/flaming smoke and precise CO detection starting at low levels.
Typically 3-5 years, with a low-battery chirp to alert you early.
Absolutely—the hush feature silences nuisances for 8-10 minutes while keeping it vigilant.
No, it's standalone, but ideal for supplemental coverage. For linking, try X-Sense.
10-year limited warranty covers defects and performance.
Every bedroom, outside sleeping areas, each level, and near fuel-burning appliances.
Protecting your family starts today—check the X-Sense Combo now!
