HD16-9-1939S-P80 GREEN 9 pin plug with locking ring – this connects to your factory connector located in vehicle. You must have the BLACK or GREEN round 9 pin diagnostic in dash to connect this side, works on both GREEN and BLACK. These are the locking ring type connectors not the smooth slide on – this insures that the connector stays connected. Other end has J1962F Female 16 pin OBD2 type connector (this is the same connector that is mounted under dash in passenger vehicles). This connects to your device such as ELD, scanner, telematics, GPS tracker and so on.
