Program card is an optional accessory which needs to be purchased separately. It has a friendly user interface. The process of the ESC programming becomes easier and faster with this pocket sized device. When the programmable value needs to be changed, please just plug the control wires of the ESC (trio wires with black, red and white color) into the socket of the program card (The socket is on the right corner, and marked with +-), and then connect the main battery pack to the ESC, each item’s value will be shown on the program card. Use “ITEM” and “VALUE” buttons to select the programmable items and new values, and then press “OK” button to store the new settings into the ESC.