In Poland it's almost 1 AM Thanks for your advices and goodnight.

Earlier I've run some test with 9V 6LR61 battery and it looked like it works fine (the led light had blue color). But it comes out that 12V is too much. I'm wondering how long it will run on this 9V battery.

Hi I'm New here but saw the Potential free problem I too was having and have found a solution that works for me. I use some Aqara LLKZMK11LM modules and those are NOT potential free without the Red Wire unfortunatelly. As my intention was to use it to open my Frontdoor StrikeLock running on 12Vac ...