Originally Posted by Fodarr

PTX Basic InstructionsPTX transponders (cloned and non-cloned) are supplied with20 stored ID numbers and come factory set on to either theclone ID, or to the custom ID for non-clone transponders.By pressing the setup button it is possible to switch fromthe cloned/custom number to the other numbers if required.To use the PTX it should be connected to a power socket ona receiver or to a battery pack. The LED will light up toshow the transponder is operating. When setting the number(or checking the number that is set) the LED will flash toshow the number selected, or the number that has been set.

To set the custom ID number hold the button down while you power on your esc... it will flicker flash.. Unplug it to set the custom ID.. when you power back on will be solid color

Hope that helps