Kidde AC Hardwired Interconnect Smoke Detector Alarm
with Hush | Model I12040
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?
- •Budget-conscious shoppers — priced below 70% of Smoke Detectors
- •Kidde loyalists — the brand spans 155 products in our database
- •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 — 58% 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 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 Kidde AC Hardwired Interconnect Smoke Detector Alarm | Most Popular BRK First Alert 9120BFF/ SMI100-AC Smoke Detector | Best Rated Kidde Smoke Detector | Best Value First Alert Smoke Alarm | |
|---|---|---|---|---|
| Price | $39.99 | $18.99 | $19.88 | $16.99 |
| Rating | 4.6/5 | 4.7/5 | 4.6/5 | 4.6/5 |
| Reviews | 814 | 19,205 | 7,603 | 4,421 |
| Mubboo Score | B+ | A+ | A | A+ |
Quick Specs
- Alarm
- Visual
- Color
- White
- Style
- Classic
- Unit Count
- 1.0 Count
- Item Weight
- 13.6 ounces
- Sensor Type
- Ionization, Photoelectric
- Manufacturer
- Kidde Safety
- Model Number
- 21026049
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
- ✦Easy Installation - Front battery pull tab allows battery activation without removing alarm from mounting bracket. Large mounting base makes mounting easier, protects surface paint…
- ✦Fewer Callbacks - One button design for easy operation and less confusion. Operates Hush and alarm test. Battery run down protection will shut down alarm memory when AC power is no…
- ✦User-Friendly Features - Tamper resist locking feature deters alarm theft. Alarm memory flashes red LED indicating which unit was the initiating alarm in interconnected system. One…
- ✦Interconnectable - Connect up to 24 devices (of which 18 can be initiating) including smoke, CO and heat alarms. See user’s guide for complete instructions
- ✦Ionization Sensing Technology
Source: product listing on Amazon.
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
If not the AC Hardwired Interconnect Smoke Detector Alarm, consider these
Bottom Line
Kidde AC Hardwired Interconnect Smoke Detector Alarm earns Mubboo Score B+. Priced at $40 — a budget-friendly option, below the category average of $77. Rated 4.6/5 from 814+ reviews. Strong buy if: budget-conscious shoppers, kidde loyalists. Skip if: brk first alert 9120bff/ smi100-ac smoke detector offers a better rating (4.7/5) at a similar — BRK First Alert 9120BFF/ SMI100-AC Smoke Detector (Score A+, $19) may fit better.
Frequently Asked Questions
Is the Kidde AC Hardwired Interconnect Smoke Detector Alarm worth buying in 2026?
It earns a Mubboo Score of B+, with a 4.6/5 rating from 814 reviews — better than 78% of Smoke Detectors we track.
How much does the Kidde AC Hardwired Interconnect Smoke Detector Alarm cost?
It is currently $39.99 — budget-tier pricing for Smoke Detectors.
How does the AC Hardwired Interconnect Smoke Detector Alarm 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 AC Hardwired Interconnect Smoke Detector Alarm carries a Mubboo Score of B+ vs A+.
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.