Product Description GEYIREN Auto Electronic Overspeed Warning System Water Temperature Alarm Car HUD OBD2 RPM Meter M6 Head-Up Display . Brand Name:Â GEYIRENOutput Frequency:Â 1~1000hzRated Power:Â 12VWire or Wireless:Â WiredSize Name:Â 90x54x12mmDisplay Size:Â 3.5 inchUpdate Years:Â 2018Function:Â speed, water temperature, battery voltageLanguage:Â EnglishExternal Testing Certification:Â Rohs, CE, FCCCar Make:Â OBD II or EU OBD interfaceProduct Name:Â head-up displayMaterial:Â ABS+PCModel:Â M6work voltage:Â 9~16V |