Using this Barco Folsom ImagePRO - II Jr 4K video scaler, scan converter, and switcher is easy. First, connect it to your device using the correct power supply that comes with it. When you're done using it, simply turn it off. Regarding the missing button caps, don't worry as it won't affect how the unit works. To keep it in good condition, clean it regularly with a soft, dry cloth. Avoid exposing it to moisture or extreme temperatures. If you have any problems, you can contact the customer service for help.