About M3 HUD: Features: 100% brand new and high quality Multifunction: speed,water temperature,voltage monitoring and fatigue driving warning. Smart size, big digital display, Easy to install, put any where. ONLY available for cars with OBD2 and EOBD agreement(European:manufactured after 2003, Other region: after 2007) Dont support JOBD and OBDI,if your car is these agreement(manufactured before 2008),please replace with other cars that comply with OBD2 interface. Specificaitons Product Name: M3 HUD Display Speed Display Unit: MPH,KMH (Exchangable) Display Data: Speed, Water Temperature, Voltage. Alarm for : Over-speed,Engine erro,Water temperature,Fatigue dreving. Connection: OBD Port Lightn Sensor: Ye Package Included: 1 x HUD Headup 1 x OBD Cable 1 x English Manual 1 x Reflective Film 1 x Sticker 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 from satellites. So if tested at home or parking lot, perhaps speed can't display correctly. Please test it on the car outside with good signal. Note: it's speed display ONLY, no other function. Specification: Model: Y03 Screen Size: 2.8 Inch Material: ABS+PC Screen Type: LED Applicable models: Universal for most vehicle Color: Black and Green Package Included: 1 x HUD 1 x Micro USB Cable 1 x Anti-Slip Gel Pad 1 x Manual