What are the alternatives to the First Alert Hardwire Smoke Alarm | SMI100-AC, 9V Battery Backup?

First Alert Hardwire Smoke Alarm | SMI100-AC, 9V Battery Backup competes with other Controllers & Gamepads products on SpecPicks. Use our Compare tool to view specs side-by-side, or browse the full Controllers & Gamepads category for alternatives.

First Alert

Hardwire Smoke Alarm | SMI100-AC, 9V Battery Backup

Name: First Alert Hardwire Smoke Alarm | SMI100-AC, 9V Battery Backup
Brand: First Alert
SKU: B0CJMN3443
Price: 19.49 USD
Availability: InStock

By SpecPicks Editorial · Verified 2026-08-09

$19.49

Buy on Amazon — $19.49 Compare to similar controllers & gamepads

*Price sourced from Amazon.com. Last updated 2026-08-09. Price and availability subject to change.

Bottom line: The Hardwire Smoke Alarm | SMI100-AC, 9V Battery Backup is a niche pick — read recent reviews before buying in the controllers & gamepads category, priced around $19.49. Read recent reviews carefully before committing.

The First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup meets new industry standards utilizing First Alert's Precision Detection advance sensing technology. This hardwire smoke alarm is easy to install and replace existing alarms with no need to rewire. Plus interconnect compatible alarms to create a whole home alarm system to help provide an early warning.

SpecPicks Verdict

SpecPicks classifies First Alert Hardwire Smoke Alarm | SMI100-AC, 9V Battery Backup as a niche pick — read recent reviews before buying in the controllers & gamepads category, based on our editorial and benchmark analysis and our ranking model that weights rating × review-volume × price-fit. First Alert's positioning sits within the broader category mid-tier. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.

Common buyer scenarios for controllers & gamepads of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.

Pros & Cons

Pros

✓ Battery backup provides continuous protection during power outages
✓ Backed by First Alert's warranty and support channels
✓ Ships via Amazon with Prime eligibility and the standard returns policy

Cons

✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified

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 home fire emergency.
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

Full Specifications

Alarm	Smoke Alarm
Brand	First Alert
Color	White
Style	Precision Detection
Unit Count	1.0 Count
Sensor Type	Ionization
Model Number	SMI100-AC
Power Source	Corded Electric
Product Style	Precision Detection
Built-In Media	Easy Adapter Plug, 9V Alkaline Battery
Item Type Name	Smoke Alarm
Mfr Part Number	SMI100-AC
Number of Items	1
Item Dimensions D x W x H	5.6"D x 5.6"W x 1"H

Ready to buy?

First Alert Hardwire Smoke Alarm | SMI100-AC, 9V Battery Backup is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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*Price sourced from Amazon.com. Last updated 2026-08-09. Price and availability subject to change.