This adapter allows you to connect your 16 pin OBD2 scanner, device or cable to BLACK 9 pin type 1 OR GREEN 9 pin type 2 Deutsch diagnostics connector found on medium and heavy-duty trucks and equipment 2005 and newer. Also connects to green 9 pin found on 2013 and newer. The gray end can also be used on 2005 and older that have the GRAY 6 pin in dash. One end has Deutsch 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!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 onProvides the following;OBD2 connector PIN SIGNAL 4 & 5 GROUND16 + 12 VDC 6 CAN/J1939 + (HI)14 CAN/J1939 - (LO)2 J1708/J1587 + (HI)10 J1708/J1587 - (LO) Features:Easily switch between older and newer modelsProvides power, ground, CAN/J1939 and J1708/J1587 data found on factory 9 Pin connectorApproximately 12" lengthDOT Certified Your package will include:6 Pin J1708 + 9 Pin J1939 to 16 Pin OBD2 Adapter CableStep-by-step guide with pictures + technical support if needed Why buy from US? 1. - You get the highest quality cable2. - Ships out same business day