Kidde Smoke Alarm SMACFEX
120V Hardwired with Battery Backup I4618AC Replacement (21033081)
Price as of 2026-06-02. Check Amazon for the current price.
Quick Decision
Is This Right For You?
- •Budget-conscious shoppers — priced below 84% of Smoke Detectors
- •Kidde loyalists — the brand spans 155 products in our database
- •You prefer well-established products — only 95 reviews, so the rating may still shift
- •BRK First Alert 9120BFF/ SMI100-AC Smoke Detector offers a better rating (4.7/5) at a similar or lower price ($19)
- •First Alert Smoke Alarm — 41% cheaper at $17 (Score A+)
- •BRK First Alert 9120BFF/ SMI100-AC Smoke Detector — higher rated at 4.7/5 ($19)
📊 Based on data analysis of 37 products in this category.
Mubboo Score: B
How It Compares
This Product Kidde Smoke Alarm SMACFEX | Most Popular BRK First Alert 9120BFF/ SMI100-AC Smoke Detector | Best Rated Kidde Smoke Detector | Best Value First Alert Smoke Alarm | |
|---|---|---|---|---|
| Price | $29 | $18.99 | $19.88 | $16.99 |
| Rating | 4.5/5 | 4.7/5 | 4.6/5 | 4.6/5 |
| Reviews | 95 | 19,205 | 7,603 | 4,421 |
| Mubboo Score | B | A+ | A+ | A+ |
Quick Specs
- Color
- White
- Style
- Modern
- Material
- Plastic
- Unit Count
- 1.0 Count
- Item Weight
- 0.86 Pounds
- Manufacturer
- Kidde
- Model Number
- 21033081
- Power Source
- Corded Electric
What People Say
Synthesized from 40 reviews · 100% verified purchases.
Test units upon arrival, as included batteries may be dead or drain quickly. Verify activation tab functions and note that sealed-battery models may not interconnect with other alarms.
- Ease of Installation
- Good Value
- Reliable Performance / No False Alarms
- Compatibility with Existing Mounts
- Long Battery Life / No Battery Changes
- Pre-installed Battery Drains Quickly
- Dead on Arrival / Activation Issues
- Flimsy Build Quality
- Confusing Instructions
Expert Picks in Smoke Detectors
- Kidde Smart Smoke Detector — Best smoke detector overall
- First Alert Battery Smart Smoke & Carbon Monoxide Alarm with Nest Protect — Best for Google Nest users
- Kidde Ring-Enabled Smart Smoke and Carbon Monoxide Detector — Best smoke detector for Alexa and Ring users
- First Alert SMI100 Dual Sensor Smoke Detector — Best budget smoke detector
Category recommendations from independent expert publications. Source links in References.
Related Video Reviews
About Kidde
- 155 products in our database
- Average rating: 4.6/5 across all products
- Price range: $12.87 – $381.75
- Categories: Carbon Monoxide Detectors, Fire Extinguishers, Smoke Detectors
Other Smoke Detectors
Bottom Line
Kidde Smoke Alarm SMACFEX earns Mubboo Score B. Priced at $29 — a budget-friendly option, below the category average of $77. Rated 4.5/5 from 95+ reviews. Strong buy if: budget-conscious shoppers, kidde loyalists. Skip if: you prefer well-established products — BRK First Alert 9120BFF/ SMI100-AC Smoke Detector (Score A+, $19) may fit better.
Frequently Asked Questions
Is the Kidde Smoke Alarm SMACFEX worth buying in 2026?
It earns a Mubboo Score of B, with a 4.5/5 rating from 95 reviews — better than 51% of Smoke Detectors we track.
How much does the Kidde Smoke Alarm SMACFEX cost?
It is currently $29 — budget-tier pricing for Smoke Detectors.
How does the Smoke Alarm SMACFEX compare to other Smoke Detectors?
The category's most-reviewed alternative is the BRK First Alert 9120BFF/ SMI100-AC Smoke Detector (4.7/5, 19,205 reviews, $18.99). The Smoke Alarm SMACFEX carries a Mubboo Score of B vs A+.
Sources & References
Mubboo may earn a commission from purchases made through links on this page. Prices and availability are accurate as of the last sync (2026-06-02) and may change.