K868-A16 433 RF MHz receiver

[Razvan]

the pin "DATA" with "GND" , whether voltage will changed when you press the remoter's any button.

I did the test. No button pressed on the remote control the values are: GND to DATA = 3.57 V, DATA to VCC = 1.38 V.
When any button on the remote control is pressed the values are: GND to DATA 3.59 V (sometimes 3, 60 V), DATA to VCC 1.38 V.
The conclusion is that when you press a button on the remote control the only value that changes is between GND and DATA, from 3.57 V it becomes 3.59 V or 3.60 V