Using this For.A HVS-391OU control panel is easy. First, connect it to your HVS-390HS switcher using the correct power supply that comes with it. When you start using the buttons, be aware that Button 12 doesn't have the white cover. Don't worry if you notice it looks a bit different. For maintenance, keep it in a dry and clean place. Avoid getting it wet or exposing it to dust. If you see any other issues or have questions, refer to the photos provided or contact our support team.