The inside siren is installed inside your building. It is the last and critical module of a complete alarm chain. The inside siren is an acoustic signal generator. You have a choice between two alarm modes in this case. 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 used to detect the status of the alarm panel (armed/disarmed). The rugged plastic housing of the acoustic signal generator is protected against sabotage by a wall and cover contact. The inside siren is powered with 12 V.