First Alert BRK FG250RV Dual Ionization Smoke Alarm with 9-Volt Battery, 1″, White

Dual Ionization Sensing ChamberSilence Feature Silences Nuisance AlarmsTamper Resistant Locking Pin Locks, Alarm Cover to Prevent Removal of Battery9V Battery IncludedApproved for RV UseFaster turnarounds on job sites with the easy-to-install, most-trusted