Abus sg1681 flashing light and siren red abus sg1681 p the abus sg1681 flashing light and siren red can be mounted inside and outside your building this combination signalling device is the crucial link of a fully functioning alarm chain in the event of an alarm the alarm sounder generates a loud intermittent tone with over 100db sound pressure p p in addition to the acoustic protection there is an optical alert from a colored flashing light 2hz frequency the alarm sounder and th