Ideal for fast flaming fires, the Hush Smoke Alarm is easy to install with no wiring necessary.Product DescriptionIt has a feature that enables the alarm to be switched off for 10 minutes in case of false alarms.It also has an ionisation sensing chamber which automatically resets once the smoke is cleared.This smoke alarm comes with a 9V battery which lasts approximately nine months.A warning signal will sound when the battery is running low.