Yes, the volume is adjustable

As already mentioned by others, the siren is not extremely loud. I am working on a solution with a plug-in siren that is controlled via the TP-Link Tapo P100 (1-PACK) V1.2 (plug for German socket). In the event of an alarm, it is not the siren in the hub that is triggered, but the switchable socket with the siren ...

It is not very loud, but can be heard well both as a doorbell and as an alarm, the volume can be adjusted, it has different types of ringtones and alarms it can be set, for example, that the opening sensor alarm only sounds if the window is opened, e.g. from 24:00 onwards until 06:00, very easy to install, also wifi

The device generates approx. 90 dB. I use it as a control unit for 2 outdoor cameras. As an alarm system, the device is better than nothing. But there are better alternatives.