First Alert 2-In-1 10-Year Battery Photoelectric Smoke & Carbon Monoxide Alarm Marshalltown No need for special gravel

No need for special gravel backfill

Liquid electrical tape

029 in the vial-up or vial-down position

Wood sizes can be 2 Ft

First Alert 2-In-1 10-Year Battery Photoelectric Smoke & Carbon Monoxide Alarm Marshalltown No need for special gravelThe SMCO210 10 year sealed battery combination smoke and carbon monoxide alarm with slim profile design. Features First Alert's Precision Detection advanced sensing technology and meets industry standards. Provides advanced protection early warning while reducing cooking nuisance alerts. This 2 in 1 alarm provides convenient protection against both fire and carbon monoxide (CO). Also equipped with a 10 year sealed battery to eliminate the need for