Essential tuning assistant designed to be used with data logging systems such as a dyno or the Mobile Dyno feature from TechnoResearch found in Centurion Pro, Centurion Pro Plus and Tune Builder Interfaces directly with any TechnoResearch VCM-TR3 communication module found with products such as Tune Builder, Centurion Pro, Centurion Pro Plus Includes two Bosch LSU 4.2 O? sensors with 7-foot long cables for easy and versatile usage No calibration required with digital precision 12 volt DC power input required. TRO2 SENSOR SYSTEM