I installed the entire doorbell system and monitor for the penthouse on the third floor! From the first days, it had problems! When they rang the bell most of the time, it showed a blue screen without me seeing, other times they could hear me but I couldn't hear them, and finally, the intercom didn't always work! All of this must be due to the touch screen! The worst part is that I sent it back 10 days ago! I am still waiting for the company to call me and tell me what is happening and what they will do! I will inform you when they decide to call me to see what they will tell me and what excuses I will hear! During all this time, I am without a doorbell and I have to run with the elevator to open the main entrance after they inform me by phone!