Thank you! I use phonechargers from renowned manufacturers. I'm nog so concerned for my 5v nodes. Planning tot rebuild them with 3.3v micro's on batteries. Now orientating on 230v switches. The relay actuator build on this site doesn't feel safe. I read relays produce heat. I'm searching for a consumer product to safely tinkering with. No 3rd party clouds, etc. Hoping someone over here has experience with the sonoff or comparable products. Tips welcome!