– 28 –• This smoke alarm works according to the principles of optics (photoelectricreflection) and contains a measuring chamber in which penetrating smokeparticles are measured.• If the alarm threshold is exceeded, a loud, audible alarm will sound.• The alarm will switch itself off as soon as the measuring chamber becomessmokefree again.Emergency procedure when alarm sounds(1) Alert all co-residents(2) Offer assistance to children, disabled and elderly people and invalids.(3) Close all windows and doors behind you.(4) Leave the building immediately.(5) Do not use the elevators.(6) Alert the fire service: tel. 112Functions and technical features | Emergency procedure when alarm sounds