4-Pack First Alert Advanced Precision Detection Hardwired Smoke Alarms with Battery Backup

Help protect multiple areas of your home with this 4-pack of First Alert Advanced Precision Detection smoke alarms. Each alarm connects to a 120 V AC household electrical system and includes a replaceable 9 V backup battery, allowing smoke detection to continue during a power outage.

Compatible alarms can be interconnected so that when one unit detects smoke and sounds, every connected alarm sounds. The system supports up to 18 compatible First Alert or BRK hardwired devices, including up to 12 smoke alarms and six compatible carbon monoxide, heat, or relay devices.

Key Features

• Four hardwired smoke alarms

• Advanced Precision Detection technology

• Designed to reduce nuisance alarms

• Designed to provide earlier warning of common fire types

• Interconnect function activates all connected alarms together

• Supports up to 18 compatible interconnected devices

• Maximum of 12 interconnected smoke alarms

• Supports up to six compatible CO alarms, heat alarms, or relay devices

• 120 V AC hardwired primary power

• Replaceable 9 V battery backup

• Four 9 V batteries included

• Combined test and silence button

• Mounting brackets included

• Meets UL 217 8th Edition smoke-alarm standards

• 10-year limited warranty

Advanced Precision Detection

First Alert’s Precision Detection technology is designed to improve responsiveness to common types of residential fires while helping reduce nuisance alarms associated with everyday household activities.

The listed sensor type is dual sensor. Proper placement and installation remain essential to alarm performance.

Whole-Home Interconnection

Compatible hardwired alarms can be interconnected through the home’s wiring. If one connected alarm detects smoke, all interconnected alarms sound, helping notify occupants in other rooms or on different floors.

The supported interconnected system may contain up to:

• 12 compatible smoke alarms

• Six compatible carbon monoxide alarms, heat alarms, or relay devices

• 18 compatible devices in total

Compatibility should be confirmed before connecting these alarms to existing First Alert or BRK devices. Interconnection requires appropriate wiring and is not described as a wireless function.

Hardwired Power with Battery Backup

Each alarm receives its primary power from a 120 V AC hardwired connection. One replaceable 9 V battery per alarm provides backup operation if household electrical power is interrupted.

The included batteries are backup batteries only. These are not standalone battery-only smoke alarms.

Test and Silence Control

A conveniently located button allows users to test alarm operation and temporarily silence eligible nuisance alarms. Every alarm should be tested after installation and regularly afterward according to the owner’s manual.

Never remove the battery or disconnect AC power to silence an active alarm without first confirming there is no fire or other emergency.

UL 217 8th Edition Standard

The alarms are designed to meet UL 217 8th Edition smoke-alarm requirements. Local installation, placement, replacement, and interconnection requirements may vary by municipality and building code.

Meeting a product standard does not automatically confirm that a particular installation complies with every local code. Consult the local authority having jurisdiction or a qualified electrician when necessary.

Specifications

• Brand: First Alert

• Model: FSMI100ACCL4

• Individual alarm model: SMI100-AC

• Product type: Hardwired smoke alarm

• Quantity: Four alarms

• Detection technology: Advanced Precision Detection

• Listed sensor type: Dual sensor

• Primary power source: 120 V AC hardwired connection

• Backup power: One replaceable 9 V battery per alarm

• Backup batteries included: Yes

• Interconnection type: Hardwired

• Maximum interconnected devices: 18 compatible devices

• Maximum smoke alarms: 12

• Additional compatible devices: Up to six CO alarms, heat alarms, or relays

• Controls: Test and silence button

• Standard: UL 217 8th Edition

• Alarm dimensions: 5.6" diameter × 1.9" H

• Listed weight: 2 lb.

• Warranty: 10-year limited warranty

• Condition: New

What’s Included

• Four First Alert Advanced Precision Detection smoke alarms

• Four mounting brackets

• Four 9 V backup batteries

• Owner’s manual

Electrical boxes, household wiring, and additional installation hardware are not specified as included.

Ideal For

• Replacing compatible hardwired smoke alarms

• Bedrooms and hallways

• Living areas

• Multiple-floor homes

• New construction or remodeling projects

• Interconnected residential alarm systems

• Homes requiring battery backup during power outages

Placement must follow the owner’s manual and all applicable local requirements.

Why It Stands Out

This four-alarm package combines hardwired reliability, replaceable battery backup, and whole-home interconnection. When one compatible alarm sounds, every interconnected unit sounds, helping extend the warning beyond the room where smoke is first detected.

Advanced Precision Detection, test-and-silence controls, included batteries, and compliance with the UL 217 8th Edition standard make the set suitable for residential alarm upgrades where compatible hardwired installation is available.

Installation and Safety

• Hardwired installation involves household electrical wiring.

• Turn off power at the circuit breaker before installation or service.

• Installation should be performed by a qualified person in accordance with the manual and local electrical and fire codes.

• Confirm compatibility before connecting to existing alarms.

• Install alarms only in approved locations specified in the manual.

• Install the included 9 V backup battery in each alarm.

• Test every alarm immediately after installation.

• Verify that all interconnected units sound during testing.

• Test alarms regularly as directed by the manufacturer.

• Replace backup batteries when the low-battery warning occurs or as directed in the manual.

• Never paint, cover, or obstruct an alarm.

• Replace an alarm at the end of its rated service life according to the manufacturer’s instructions.

• If an alarm sounds, follow your household emergency plan and contact emergency services when appropriate.

• Smoke alarms reduce risk but cannot prevent fires or guarantee escape.

Warranty and Support

The alarms include a 10-year limited warranty. Warranty terms, exclusions, and return procedures are provided in the owner’s manual and through First Alert.

First Alert customer service: 1-800-323-9005

Frequently Asked Questions

How many alarms are included?

The package includes four First Alert hardwired smoke alarms.

Are these battery-operated alarms?

Their primary power source is a 120 V AC hardwired connection. Each alarm also uses an included 9 V battery for backup during a power outage.

Do the alarms communicate wirelessly?

Wireless interconnection is not specified. These units use compatible hardwired interconnection.

What happens when one interconnected alarm detects smoke?

All properly installed and compatible interconnected alarms sound together.

How many alarms can be interconnected?

The system supports up to 18 compatible First Alert or BRK devices, including no more than 12 smoke alarms and up to six compatible CO alarms, heat alarms, or relays.

Can they connect to any existing smoke alarm?

Not necessarily. Existing devices must be compatible First Alert or BRK hardwired models. Verify compatibility before installation.

Are the backup batteries included?

Yes. Four 9 V batteries are included—one for each alarm.

Do these alarms include a test button?

Yes. Each alarm has a combined test and silence button.

Do they meet current smoke-alarm standards?

They are listed as meeting the UL 217 8th Edition smoke-alarm standard. Local building and fire-code requirements should also be verified.

Is professional installation recommended?

Because the alarms connect to 120 V household wiring, installation should be completed by a qualified person in accordance with the manufacturer’s instructions and local codes.

How long is the warranty?

The product includes a 10-year limited warranty. Refer to the owner’s manual or First Alert for complete terms.