First Alert SMI100-AC
Hardwire Interconnect Smoke Alarm with Battery Backup, 6-Pack
Price as of 2026-06-02. Check Amazon for the current price.
Quick Decision
Price Intelligence
- Budget:$17–$39
- Mid-range:$39–$93← You are here
- Premium:$93+
Is This Right For You?
- •Buyers who prioritize quality over price in Smoke Detectors
- •Those who want a top-rated option — in the top 5% of Smoke Detectors by rating
- •First Alert loyalists — the brand spans 100 products in our database
- •You're on a tight budget — $16 above the category average of $77
- •You prefer well-established products — only 96 reviews, so the rating may still shift
- •Kidde AC Hardwired Interconnect Smoke Detector Alarm — 57% cheaper at $40 (Score B+)
📊 Based on data analysis of 37 products in this category.
Mubboo Score: C+
How we calculate the Mubboo Score
Quality (45%): customer rating, normalized to a 10-point scale
Popularity (35%): review volume vs the category leader, log-scaled
Value (20%): price position vs other Smoke Detectors
Computed from live Amazon rating, review count, and price across 37 Smoke Detectors available to US consumers · last refreshed 2026-06-02.
How It Compares
This Product First Alert SMI100-AC | Most Popular Kidde Hardwire Smoke Detector | Best Rated First Alert BRK Smoke Alarm | Best Value Kidde AC Hardwired Interconnect Smoke Detector Alarm | |
|---|---|---|---|---|
| Price | $93.26 | $42.99 | $98.94 | $39.99 |
| Rating | 4.7/5 | 4.5/5 | 4.5/5 | 4.6/5 |
| Reviews | 96 | 2,323 | 878 | 814 |
| Mubboo Score | C+ | B+ | B- | B+ |
Quick Specs
- Alarm
- Audible
- Color
- White
- Style
- hardwired smoke alarm
- Unit Count
- 6.0 Count
- Item Weight
- 0.6 Pounds
- Sensor Type
- Ionization
- Manufacturer
- Resideo
- Model Number
- SMI100-AC
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
Key Features
- ✦First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a ho…
- ✦Through early warning interconnect, when one alarm sounds, all compatible alarms will sound
- ✦Battery backup provides continuous protection during power outages
- ✦Alarm indicator visually identifies the unit that initiated the alarm
- ✦Quick Connect Plug included allows for easy installation with no need to rewire
Source: product listing on Amazon.
About First Alert
- 100 products in our database
- Average rating: 4.6/5 across all products
- Price range: $13.98 – $648
- Categories: Carbon Monoxide Detectors, Fire Extinguishers, Smoke Detectors
If not the SMI100-AC, consider these
Bottom Line
First Alert SMI100-AC earns Mubboo Score C+. Priced at $93 — a premium option, above the category average of $77. Rated 4.7/5 from 96+ reviews. Strong buy if: buyers who prioritize quality over price in smoke detectors, those who want a top-rated option. Skip if: you're on a tight budget — Kidde Hardwire Smoke Detector (Score B+, $43) may fit better.
Frequently Asked Questions
Is the First Alert SMI100-AC worth buying in 2026?
It earns a Mubboo Score of C+, with a 4.7/5 rating from 96 reviews — better than 95% of Smoke Detectors we track.
How much does the First Alert SMI100-AC cost?
It is currently $93.26 — premium-tier pricing for Smoke Detectors.
How does the SMI100-AC compare to other Smoke Detectors?
The category's most-reviewed alternative is the Kidde Hardwire Smoke Detector (4.5/5, 2,323 reviews, $42.99). The SMI100-AC carries a Mubboo Score of C+ vs B+.
Sources & References
Products available through US retailers. Prices in USD. Sales tax varies by state and is not included.
Mubboo may earn a commission on purchases made through affiliate links. This does not affect our Mubboo Score, product rankings, or editorial judgments. Prices are accurate as of the last sync (2026-06-02) and may change.