There are many potential causes of fire in your own four walls. Smoke detectors can save lives. In case of fire or smoke development every second counts to extinguish small fires immediately and to bring yourself and others quickly to safety. The POPP smoke detector with controllable siren version 1.2 reliably detects developing fires and smoke. In case of an emergency, it sounds an acoustic alarm and automatically sends a signal to all POPP smoke detectors within range so that they are also triggered. This so-called meshing works completely automatically and without additional configuration. This ensures that all persons, even on another floor, or at night while sleeping, hear the alarm sound.