Abus alarm siren 110db abus sg1250 p the abus alarm siren 110db is an inside siren that can be installed inside your building and acts as the last and critical module of a complete alarm chain p p the inside siren is an acoustic signal generator with a choice between two alarm modes a 110 db alarm and a 90 db acknowledgement tone both signals are felt to be extremely loud due to the high acoustic pressure and the signal frequency the remotely activated led of the alarm siren can be us