Ultra - will the siren activate on its if someone breaks in?

[Jmilton]

Is Arlo Ultra really a break-in deterrant? If I am traveling and have no access to my phone while flying will the siren activate on its if someone breaks in? I'm trying to figue out if I need a normal alarm system along with arlo. thanks

[TomMac]

The Ultra can be set to sound the alarm on motion detect.... tho it is not overly loud, the person will know they set it off.

( the pro/pro2 siren in base is loud )

As to a full alarm system, you can never have to much it seems., even if used once.