External sirens are designed to let those nearby know that a home may be under threat (unfortunately, these signals can sometimes be ignored). This function is irrelevant for anyone with an ADT burglar alarm, because our monitoring centre will already have been alerted, ensuring a swift response.
That’s why we place our siren inside the home, where it can do a better job of disorientating any intruder who may have gained access. That said, some customers do feel more comfortable having an external sounding bell box; this can be added to your system if requested.