Genuine Fujitsu UTY-RNRYT5 Backlit Touch Panel Wall Controller is a wired touch-screen controller for running and setting your air conditioning from the wall. It has its own built-in temperature sensor, so the system can read the temperature at the wall where you are rather than up at the indoor unit, and one controller can run up to 16 indoor units together. The genuine controller shows any system error on its home screen, so a problem is easy to spot.