Kidde 21007584 I4618 Firex Hardwire Ionization Smoke - Smoke Detectors | Mubboo
Kidde

Kidde 21007584 I4618 Firex Hardwire Ionization Smoke

Detector with Battery Backupwhite

$66.95$503.64Save 87%4.4(323 reviews)
Mubboo Score B-
Buy on Amazon $66.95

Price as of 2026-06-02. Check Amazon for the current price.

Quick Decision

Mubboo Score
B-
Best For
Kidde loyalists
Skip If
First Alert SMI100 offers a better rating (4.6/5) at a similar or lower price ($35)
Reviews
323+ · reasonably reliable

Price Intelligence

📊 In Smoke Detectors, this is a mid-range product.
  • Budget:$17–$39
  • Mid-range:$39–$93← You are here
  • Premium:$93+

Is This Right For You?

✅ Great for
  • Kidde loyalists — the brand spans 155 products in our database
⚠️ Think twice if
  • First Alert SMI100 offers a better rating (4.6/5) at a similar or lower price ($35)
💡 Consider instead
  • 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-

Quality8.8/10
based on 4.4/5 customer rating
Popularity5.9/10
323 reviews, top 65% in Smoke Detectors
Value4.1/10
priced below 41% of Smoke Detectors
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
Rating4.4/54.6/54.6/54.1/5
Reviews3234,4218142,033
Mubboo ScoreB-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.

Praised for
  • Ease of Installation
  • Good Value
  • Reliable Performance / No False Alarms
  • Compatibility with Existing Mounts
  • Long Battery Life / No Battery Changes
Common complaints
  • Pre-installed Battery Drains Quickly
  • Dead on Arrival / Activation Issues
  • Flimsy Build Quality
  • Confusing Instructions

Expert Picks in Smoke Detectors

cnet
  • 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

💰 Save money
First Alert Smoke Alarm, Battery-Operated Detector with Test & Silence Button, SMI100, 1-Pack - Smoke Detectors | Mubboo
First Alert Smoke Alarm
$16.99 · 4.6 (4,421)
$50 less than the 21007584 I4618 Firex Hardwire Ionization Smoke, with 4.6★ from 4,421 reviews
Higher rated
BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack - Smoke Detectors | Mubboo
BRK First Alert 9120BFF/ SMI100-AC Smoke Detector
$18.99 · 4.7 (19,205)
4.7★ vs 4.4★ — rated 0.3 higher by 19,205 reviewers
🔥 Most popular
First Alert Smoke Alarm, 10-Year Sealed Battery Detector with Test & Silence Button, SMI110, 1-Pack - Smoke Detectors | Mubboo
First Alert Smoke Alarm
$24.47 · 4.4 (8,237)
8,237 reviews — 25.5× more than the 21007584 I4618 Firex Hardwire Ionization Smoke
See all Smoke Detectors

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.

Buy on Amazon $66.95Last verified: 2026-06-02

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.