This Sony MKS - 8011A Menu Panel Switcher doesn't come with a connection cable. A known issue is that several button caps are missing, but don't worry, the buttons still work fine.

To use this Sony MKS - 8011A Menu Panel Switcher, first, make sure you have your own connection cable as it's not included. Then, connect it to your device. When operating, you'll notice that some button caps are missing, but the buttons are fully functional, so just press them as normal. As for maintenance, keep it in a dry and clean place. Avoid exposing it to extreme temperatures or humidity. If you find any further problems, it's best to contact a professional technician.