First Alert Hardwired Heat Alarm with Battery Backup, BRK Brands HD6135FB - Combination Smoke Carbon Monoxide Detectors - Amazon.com
First Alert HD6135FB BRK Brands Hardwired Heat Alarm with Battery Backup
This heat detector in my house started beeping this morning. I tried to remove it to replace the batteries, but I have no clue what's going on in here. Is it safe