Sikom Radio Protocol 1 (older)
Please note that a lot of new auxiliary equipment supports both old and new Sikom radio protocol(Sikom Radio Protocol 1 (older) and Sikom Radio Protocol 2 (newer))
However, newer central units such as GSM Eco-Comfort and GSM Eco-Starter do not support old auxiliary equipment.
Runs either on mains electricity or 9V battery.
The smoke detector will of course have a local alarm as well as sending a warning to you.
If one detector is set off all other detectors will also be activated.