Output Frequency:1-100HZ Rated Power:20W Wire or Wireless:Wired Display Mode:Head-Up display, car,HUD,OBD+GPS HUD System:OBD2+GPS Suitable for:Cars with OBD2/EUOBD Interface Function 1:speed Function 2:clock Function 3:Rotating speed Function 4:Voltage Function 5:water temperature Function 6:travel time Function 7:Travel distance Function 8:Altitude Function 9:Accelerated testing Function 10:brake test Function 11:Turbine test Function 12:engine load Call the police1:fatigue driving Call the police2:High water temperature alarm Call the police3:Low voltage alarm Call the police4:Overspeed alarm characteristic:auto parts,car accessories,Car electronic accessories Speed unit:- mile, KM/H- kilometer Colour:black Material:plastic Package Contents: 1 x Car Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.