This is an FM trainer cord to go between a Futaba radio with the square trainer port and the older round DIN connector. Examples are the 9C to 8U or the 4YF to 6X.
Note: A Micro plug is square in shape with six internal pins, and found on the Tower 4-TH, Futaba 4YF, 6EXA and 9C radios. This trainer cord can be used with Hitec radios as students. Unfortunately you cannot use a Hitec radio as a teacher/master radio. It is recommended that the student radios should be shut OFF.