Combination disappointing:
1. it lacks the battery (special shape: 12V)
2. In order to insert the battery, all 3 buttons must be dismantled. The bracket breaks.

Better is the 4-fold button. The battery compartment is easier to open without breaking anything.

Very good switch works well and it was very easy to connect it with the application, very good quality I recommend it, I will buy two more.

After plugin the switch, two of my bulbs are hs.

The switch is one of the best for the money offered. I use it in zigbee2mqtt, the relay can be disabled and use the key as a smart button, assigning control of other devices or scenarios. It is preferable to use the version with zero, the version without zero seemed that it has a slightly higher delay, I do not know what is connected with, perhaps because it does not work in router mode. Mechanically very pleasant, does not rattle, everything is quiet and tactile pleasant. Design is great, fits most interiors. Wish to the manufacturer to make versions with removable frames for 2-3-4 switches

Works perfect with Alexa and Google Nest!