Kidde 21007584 I4618 Firex Hardwire Ionization Smoke
Detector with Battery Backupwhite
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?
- •Kidde loyalists — the brand spans 155 products in our database
- •First Alert SMI100 offers a better rating (4.6/5) at a similar or lower price ($35)
- •Kidde Smoke Detector — 56% cheaper at $29 (Score B+)
- •First Alert SMI100 — higher rated at 4.6/5 ($35)
📊 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 21007584 I4618 Firex Hardwire Ionization Smoke | Most Popular First Alert SMI100 | Best Rated Kidde AC Hardwired Interconnect Smoke Detector Alarm | Best Value Kidde Smoke Detector | |
|---|---|---|---|---|
| Price | $66.95 | $34.98 | $39.99 | $29.21 |
| Rating | 4.4/5 | 4.6/5 | 4.6/5 | 4.1/5 |
| Reviews | 323 | 4,421 | 814 | 2,033 |
| Mubboo Score | B- | A- | B+ | B+ |
Quick Specs
- Alarm
- Audible
- Color
- White
- Style
- Hardwired Smoke Detector
- Unit Count
- 1.0 Count
- Item Weight
- 21.6 Pounds
- Sensor Type
- Ionization
- Manufacturer
- Kidde
- Model Number
- 21007584
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
- ✦Tamper resist locking feature deters alarm theft
- ✦Alarm memory flashes red LED indicating which unit was the initiating alarm in interconnected system.
- ✦TBattery backup provides protection in case of power failure
- ✦Interconnectable with up to 24 devices (of which 18 can be initiating) including smoke, CO and heat alarms. See user’s guide for complete instructions.
- ✦Front battery pull tab allows battery activation without removing alarm from mounting bracket.
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 21007584 I4618 Firex Hardwire Ionization Smoke, consider these
Bottom Line
Kidde 21007584 I4618 Firex Hardwire Ionization Smoke earns Mubboo Score B-. Priced at $67 — a mid-range option, below the category average of $77. Rated 4.4/5 from 323+ reviews. Strong buy if: kidde loyalists. Skip if: first alert smi100 offers a better rating (4.6/5) at a similar or lower price ($35) — First Alert SMI100 (Score A-, $35) may fit better.
Frequently Asked Questions
Is the Kidde 21007584 I4618 Firex Hardwire Ionization Smoke worth buying in 2026?
It earns a Mubboo Score of B-, with a 4.4/5 rating from 323 reviews — better than 38% of Smoke Detectors we track.
How much does the Kidde 21007584 I4618 Firex Hardwire Ionization Smoke cost?
It is currently $66.95 — mid-tier pricing for Smoke Detectors.
How does the 21007584 I4618 Firex Hardwire Ionization Smoke compare to other Smoke Detectors?
The category's most-reviewed alternative is the First Alert SMI100 (4.6/5, 4,421 reviews, $34.98). The 21007584 I4618 Firex Hardwire Ionization Smoke 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.