First Alert SMI100 Battery-Operated Smoke Alarm Work Belts & Suspenders The smooth magnesium blade opens

The smooth magnesium blade opens up the pores on the surface to allow proper evaporation

and the fractional blade graphics help make measurements quick and easy

The Coupler Lock is designed to fit 1-7/8 in

Fixed Resistance

First Alert SMI100 Battery-Operated Smoke Alarm Work Belts & Suspenders The smooth magnesium blade opensThe 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