What is a PicKit 2 "programmer extension"?

I recently bought a nice PK2 burner off ebay, and the seller mentioned
it has a "programmer extension" not included. Not sure what that
means.

Here is the snippet from the ebay page:

"You are bidding on one pic kit 2 programmer for be used with
Microchip PICKIT2 to work on pic microcontrollers just using your own
circuit and the ICD2 interface or the available programmer extension
(not included)."

-Josh
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