The portable program card is an optional accessory applicable for field use. Its friendly interface makes the ESC programming easy and quick. Before the programming, you need to unplug the throttle control cable (or Rx cable) from the receiver and plug it into the programming/ESC port on the program box, and then turn on the ESC, all programmable items will show up a few seconds later. You can select the item you want to program and the setting you want to choose via “ITEM” & “VALUE” buttons on the program card, and then press the “OK” button to save all new settings to your ESC.