ABUS 277 Alarm - Level 9Mechanical protection from hardened steel, supplemented by a 100 dB loud alarm unit making the 277A a reliable partner for everyday use. THE LOCK THAT SOUNDS THE ALARM Mechanical security paired with a 100 dB loud alarm signal A 10 mm strong locking bolt made of hardened special steel provides solid basic security for the 277 Alarm disc brake lock. The additional alarm function provides a 100 dB loud alarm sound in the event of an attack, which