Technical parameters: Operatingvoltage: 9~32VDCOperating current: 100mAOperating temperature: -20~ 70Storage temperature: -30~ 80 TRIP:Single mil eagezero power down. ODO:Accumulated mileagepower outage data canbe saved. Connection: 1 Black: Ground(-) 2 Red: 9-32VDC 3 Yellow: Switch unit The yellow line intermittently contacts the negative electrode, which can realize the switching ofknot, MPH, km/h units, and automatically save. Features: 1. Tachometer-Anzeigebereich: 0-999,9 2. Anzeigebereich der Gesamtkilometer: 0-999999 3. Anzeigebereich der Tageskilometer: 0-999,9 4. Digitaler Kompass: 0-359 5.TRIP:Single mil eagezero power down 6.ODO:accumulated mileagepower outage data can be saved The yellow line intermittently contacts the negative electrode, which can realize the switching of knot, MPH, km/h units, and automatically save. Package1 Includes: 1 X 52MM Speedomerter 1 X GPS Antenna 1 X Installation Package2 Includes: 1X52MM Gauge Holder