apparmeters: 1.rating voltage:12V 2.working voltage:DC9V+2V 3.the distance between magnetic core and sensor is :2-3mm 4.working temperatureï¼ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ-20°--- +70° functions: A. show right and left B. show high postion ,low postion ,the reverse gear and no gear. C. show the parking D. with the urgency light ,and the warm of water temperature. E. show the high beam and the postion beam F. show the time G. show the 4 drive ,the quality of oil H. the accumulation mileage and subtotal mileage to show with LCD digital . show the mph and rotate speed