This Crestron card interface comes with three C3COM - 3 cards installed. However, it does not include a power supply. It's a great option for those who already have a suitable power supply on - hand.

Using this Crestron card interface is straightforward. First, make sure you have your own power supply ready as this product doesn't come with one. Install the three pre - installed C3COM - 3 cards in your desired setup. When using, always check the connections to ensure stable performance. As for maintenance, keep the interface clean from dust. If you notice any issues with the cards, try gently re - inserting them. Also, avoid exposing the product to extreme temperatures or humidity. That way, your Crestron card interface will serve you well for a long time.