The optical radio smoke detector RM40 Li emits a loud alarm at 85 dB as soon as smoke enters the measurement chamber. A total of up to 32 smoke detectors can be interconnected. When an alarm is triggered by one smoke detector, it is automatically transmitted via radio to all smoke detectors in the system, which will also sound a loud alarm. This is especially important if you live on multiple floors, in a large house, or if the children's room is far from the parents' bedroom. This way, all residents are alerted in the event of a fire and can get to safety in time. Tested according to DIN EN14604.