First Alert SMI100 Battery-Operated Smoke Alarm Size:1.9 in H x 5.4 in L x 5.4 in W Screw snaps are made of

Screw snaps are made of brass and are nickel plated for added durability

4W Voltage: 120V

designed for maximum performance in general purpose nail embedded wood & metal applications

antiscald protection turns On in cold position for safety

Designed As A Replacement Hinge For Tubular Pipe Gates

First Alert SMI100 Battery-Operated Smoke Alarm Size:1.9 in H x 5.4 in L x 5.4 in W Screw snaps are made ofThe First Alert SMI100 Battery Operated Smoke Alarm is available in a convenient two pack. The SMI100 smoke detector is equipped with First Alert's Precision Detection advanced sensing technology and meets new industry standards. This battery operated alarm is easy to install and the front access battery compartment makes for easy battery replacements. First Alert's Precision Detection advanced sensing technology complies with new industry standards