Hello maldahleh,
Thank you for reaching out to the Google Community Forum. I understand that you have concerns about whether your wiring system is compatible with the Nest Learning Thermostat 4th generation. Don't worry; I'm more than happy to help you.
I appreciate the picture you've shared with me. Based on this information, to install this unit, I recommend consulting with a professional for optimal performance of your thermostat. To get more information, check out this article: Identify a wire.
If you have more questions, feel free to write in this post.
Best regards,
Daniel
