The Haltech DR2 is a two channel analog/digital converter. This unit is connected to an analog VR sensor and converts the VR sensor's sine wave output to a digital, square wave format. Common uses are for crank and cam triggers and wheel speed sensors. Most ECUs will accept VR sensor inputs for trigger and synch signals, but may require a square wave format for wheel speed, driveshaft speed, etc. The DR2 is very handy for converting OE VR wheelspeed sensors for this use. Unit includes 2m flying lead harness, no shown.