The First Alert Precision Detection series smoke alarm is sold in a convenient 4-pack. The smoke alarms are 120V AC hardwired with battery backup. Capable of wiring directly into your home electrical system. Equipped with a mute button to quickly silence your alarm as well as testing its function. The battery backup provides optimal protection in the event of a power outage. These alarms are also capable of interconnecting with up to 18 (12 smoke, 6 CO/ heat/ relay) other First Alert or BRK hardwired alarms.

Features: 

• Advanced Precision Detection technology
• Precision Detection less nuisance alarms and an earlier warning to the most common types of fires
• In an Emergency, Every Second Count, You need to be alerted immediately if there is a danger in your home…wherever you are
• These alarms are also capable of interconnecting with up to 18 other First Alert or BRK hardwired alarms (12 smoke, 6 CO/Heat AAlarms/Relays)
• Battery Backup (Batteries Include) Alarm will continue functioning in the event of a power outage
• 10-year limited warranty for maximum protection
• Meets UL217 8th Edition Smoke Standards

Includes: 

• Advanced Precision Detection Technology
• 4 Alarms
• 4 Mounting Brackets
• 9v Battery per alarm
• Owner’s manual

Specifications: 

• Battery Operated (Batteries Included)
• Dimensions: 5.6” diameter x 1.9”H 
• Weight: 2. lbs
• Designed to meet or exceeds municipal building codes

Warranty: 

• 10 -Year – visit www.firstalert.com for details
• Details found in manual

Customer Service: Call us at 1(800) 323-9005 to establish warranty return set up