The new Gira smoke alarm device Dual / Vds is equipped with two identification processes, thus achieving double the level of safety. It optically identifies small smoke particles before the situation gets too dangerous for people. And in addition thermal sensors measure temperature changes within the room; in this way various types of fire such as smouldering fires or liquid fires can be more rapidly registered and securely identified. Alarm behavior can also be better controlled in application areas with unavoidable disturbance factors such as kitchen vapours, dust and electrical interference.