Edited by Avant on 23/10/2015 at 00:37
As I recall they come with three connectors and one interface for the lappy.
the round connector is for older vehicles,
the connector with crocky clips is for realy old and the last one is the one you'd use,
industry standard DIL,
Dual in line multi plug.
The important thing is to find a seller selling one which has the REV C firmware in it.
Without that you're limited to Peugeot Planet and Diagbox 5, which is ancient, slow, clunky and unreliable.
Diagbox 7.76 is the latest release.