Smoke Alarm, Hardwired w/Battery Backup, Interconnected 6-Pack Category_Insulation FEATURESExclusive Alflo® rung joint means

FEATURESExclusive Alflo® rung joint means Twist-Proof® performanceClimb and carry rail shape improves ergonomics and comfort for user1

Dimensions: 2-1/2" x 3-1/2" x 21"

Heavy duty fiberglass core insert provides extra strength at this point of greatest stress

ADA (Americans with Disabilities Act) compliant

Smoke Alarm, Hardwired w/Battery Backup, Interconnected 6-Pack Category_Insulation FEATURESExclusive Alflo® rung joint meansFirst Alert, 6 Pack, 120V AC Hardwired Smoke Alarm, With Battery Back Up, Equipped With An EZ Access Battery Door That Removes The Hassle & Burden Of Collecting Your Alarm From The Ceiling & Replacing Its Batteries, Provides Optimal Protection In The Event Of A Power Outage & An Increased Emphasis On The Unit's 85 Db Output, Are Capable Of Interconnecting With Up To 18 Other First Alert Or BRK Hardwired Alarms, 10 Year Limited Warranty, Complies With