Siren loudness (if built-in)

A built-in siren is available in-app as a deterrent feature, with reviewers generally treating it as a useful extra rather than a daily-use tool.

Several hands-on reviewers demonstrate or describe a tamper alarm and siren when the unit is removed, suggesting the D210 can make itself very noticeable. One written review disputed that point, so the evidence is positive but not perfectly consistent.

A built-in siren is mentioned as a valuable deterrent feature, and at least one reviewer describes it as quite loud. It is typically controlled from the app as part of the security feature set.

The doorbell includes a built-in siren option, though at least one reviewer wanted it louder and treats it as a secondary deterrent feature.