Abus flashing light and siren blueyellowred abus sg1683 the abus sg1683 flashing light and siren blue 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 in addition to the acoustic protection there is an optical alert from a colored flashing light 2hz frequency the alarm sounder and the li