First Alert 1039807 Hardwired Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup BF10 Overall length: 5-1/4" (133 mm)

Overall length: 5-1/4" (133 mm)

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This is what heats the oil

First Alert 1039807 Hardwired Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup BF10 Overall length: 5-1/4" (133 mm)The First Alert Hardwired Combination Smoke and Carbon Monoxide Alarm uses an electrochemical CO sensing technology and Ionization sensor for smoke detection. It includes a 9 volt battery for continued function in the event of a power outage, and it features a test silence button, tamper resistant locking brackets, and a universal mounting bracket. This CO smoke detector can be connected to other compatible BRK and First Alert hardwired smoke and