The loop sounder-strobe FI700/WB/MT/SOUW/STRC is actuated and supplied via the ADM loop with Labor Strauss/700 protocol. Depending on the parameter setup of the fire detection control panel and the system condition, the control panel can activate the sounder with tone A, B or C. If several sounders are actuated in parallel, they are synchronised by the fire detection control panel to generate a uniform warning tone. The red strobe is activated together with the sounder