These are two STUDER Parallel Remote Controls for the Studer A820. I put the one in usage near the left rear corner of the listening room being positioned left besides of the chair. When intialising the remote control on the panel of the A820 (see the light) it allows controlling the basic functions from the remote as well as from the A820 itself. Using a serial remote (the big one with the time counter) you need an interface (IF 1.820.729) behind the autolocator connection. In that case you can control all functions- including the shuttle knob. These Studer controls come with a wonderful haptic feeling when pressing the buttons.