From the user manual - " How to silence the alarms in network when alarm sounds. If n alarm detects and triggers, the device will go into Source / Master alarm sound pattern and emit the alarm signal; When other alarm devices receive an alarm signal, they will go into Slave alarm sound pattern until the Source / Master device alarm is stopped; When the alarms are triggered and sounding, you can find out the Source / Master alarm. Press a Test / Silence to pause all other interconnected alarms. " It looks from another video like the " Slave " units flash & bleep continuously but the Source / Master does 3 flashes & bleeps ... pauses ... then repeats the pattern of 3 and a pause !
