Functions:Alarm functions, including speed, water temperature, low voltage, high voltage, fatigue driving, vehicle DTC and other alarms.OBD mode functions: vehicle speed (Km/h or MPH) engine speed, water temperature (C or F), voltage clock, fuel consumption, single driving distance, travel time, oil temperature, turbo pressure, air-fuel ratio, number of satellites, altitude, driving direction, acceleration test, brake test fault code fault code clear latitude and longitude.GPS mode function: vehicle speed (Km/h or MPH), voltage, driving time, driving distance, clock, driving direction, altitude, number of satellites.With this head-up display, you can clear the fault codes yourself without having to go to a repair store and pay for the repair.5 display pages, 5 interfaces, free switching, LCD gauges, clear display of various data.2 types of installation: with adjustable bracket, mounted on the dashboard or attached to the windshield.It allows you to understand your car more clearly without looking down at the dashboard and adds a sense of technology to your car.Touch screen buttons. Specifications: Material: ABS+PCScreen Size: 4 InchScreen Type: LCDInput Signal: OBDApplicable models: UniversalColor: Black Note: OBD2 model can work for OBD2 gasoline vehicles produced after 2004 in USA, and OBD2 gasoline vehicles produced after 2008 in other countries.Hybrid and diesel powered cars, pickups, SUVs, and ORVs are not supported.The F11 includes both OBD and GPS chipsets, OBD may not be compatible with your car, but it"'"s still a cool HUD because its GPS works on all vehicles. Package Included: 1 x F11 HUD1 x OBD Cable1 x Rotary Holder1 x English Manual About Y03 HUD:Functions: GPS and Beidou dual chips, the speedometer is very accurate, and the speed is refreshed quickly without any delay.Innovative design, with sunshine hood itself, good review even under sun.Plug & Play, after connect power supply, it will work directly, no need any other operation.Large font, clearly visible both during the day and at night. Speed unit is KMH (not support MPH). Wide application, it can work on all cars, trucks, buses, E-scooters, E-bikes.The Device is GPS Digital Speedometer, and speed is collected fromsatellites. So if tested at home or parking lot, perhaps speed can"'"tdisplay correctly. Please test it on the car outside with good signal.Note: it"'"s speed display ONLY, no other function. Specification: Model: Y03Screen Size: 2.8 InchMaterial: ABS+PCScreen Type: LEDApplicable models: Universal for most vehiclesColor: Black and Green Package Included: 1 x HUD1 x Micro USB Cable1 x Anti-Slip Gel Pad1 x Manual Do drop