How loud should the on-device alarm be?

Most reviewers consider 90 dB the practical floor for a sensor you expect to hear from another room. The Tapo T300 and Govee WiFi detectors land at 90–100 dB in published specs, which mainstream reviewers describe as audible but not piercing. If the sensor will live in a basement or under a vanity behind a closed door, prioritize push notifications and SMS alerts rather than relying on the local siren alone.