First Alert 1039809 Hardwired Ionization Smoke Alarm with Battery Backup BackToSchool Cut out: 24-1/4" x 21-1/4"

Cut out: 24-1/4" x 21-1/4"

Meets ASTM standard C475

Bi-metal construction allows blades to bend and flex without breaking

AC/DC current

Spring loaded release

First Alert 1039809 Hardwired Ionization Smoke Alarm with Battery Backup BackToSchool Cut out: 24-1/4" x 21-1/4"Designed to help promote household safety, the First Alert Hardwired Smoke Alarm with Battery Backup can provide a vital early warning of fire. This hardwired smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, fast flaming fires. Comes equipped with an ultra reliable ionization sensor to provide the earliest possible warning of a fast flaming fire. The sensor is optimized to detect flaming fires, such as those caused by