The first impression was that the cap of the dimmer is very shaky. A training to Home Assistant by Zigbee 2Mqtt worked without any problems and after a while all functions were available. Unfortunately, the dimmer with a button reacts only very unreliably. Sometimes it works, sometimes many seconds later, sometimes not at all.
I will dispose of the button and replace it with another, as this does not ensure reliable function. Can be.

Works

very good product for this money

The seller sent the goods to another address. In the correspondence he assured that according to the old. The movement of the goods on the website was not tracked.

Seems to work well, need to restart Home Assistant after pairing with ZHA, otherwise it freezes when connecting to the device and doesn’t have any entity sensors.