First Alert 10-Year Battery-operated Combination Smoke and Carbon Monoxide Detector Item #12157 | Model #384211 and the ends are square-cut

and the ends are square-cut and finished smooth

Polished Chrome Finish

Fully automatic and easy to install

feeder or floater

5-in H x 19-in diameter profile is designed for easier installation

First Alert 10-Year Battery-operated Combination Smoke and Carbon Monoxide Detector Item #12157 | Model #384211 and the ends are square-cutThe First Alert BRK PRC700 battery operated smoke and carbon monoxide alarm features a photoelectric smoke sensor and an electrochemical carbon monoxide sensor. The photoelectric sensor detects larger smoke particles from smoldering fires from objects like cigarettes burning on furniture or in trash cans. The alarm features a loud, 85 decibel alarm, designed to wake even the soundest of sleepers. One button silences any nuisance alarms, and also tests