Using this JVC VF - HP790G viewfinder is easy. First, connect it to your device using the included VF cable and connection cables. Make sure the connections are secure. When using it, place it in a well - lit area to get the best viewing experience. Avoid exposing it to direct sunlight or extreme temperatures. For maintenance, clean the LCD screen gently with a soft, dry cloth. If there are stubborn stains, you can use a small amount of screen - cleaning solution. Don't forget to turn off the power before cleaning. Keep the cables organized and stored properly when not in use to prevent damage.