In all First Alert® ONELINK® alarms, there are two silence features: Alarm Silence can quiet nuisance alarms for several minutes. Low Battery Silence can temporarily silence the low battery chirp for up to eight hours before replacing the battery. This is a key feature when the low battery chirp begins in the middle of the night and you do not have any replacement batteries. You can quiet the chirp and then replace the batteries when it's more convenient.