Siren Marine Audible Alarm [SM-ACC-ALRM]Siren Marine Audible Alarm The Siren Marine audible alarm produces a powerful beeping sound (105 decibels). The alarm can be connected to one of the outputs on the MTC, which will allow it to be turned on and off from the "switching" section of the Siren Marine App. It can also be mapped to specific inputs (such as a motion sensor) in the app and programmed to turn on automatically. Features: Automatically adjusts to a supply voltage range of 12 80V