HUD short for Head Up Display,the main function is to display the car dashboard information (e.g.speed,RPM,water temperature,voltage,trip distance etc ),and keep the driver eyes always on road to avoid the dangerous of lowering down head to read the dashboard. Features: Multi function: speed,engine RPM,water temperature,voltage,driving distance: speed,engine RPM,water temperature,voltage,driving distance. Alarm: water temperature alarm, voltage alarm, gear shift reminder, overspeed alarm, fatigue driving reminder, engine failure alarm. Exquisite design. High-definition display lens, not affected by external light. The stereoscopic imaging of the highlighted LED display does not have ghosting, no film is required, and there is no unnecessary reflection. Plug and play, easy to operate. Hi-tech assisted driving is safer. The HUD can eliminate the trouble code displayed on the engine dashboard. No need for professional equipment. The product automatically switches on and off. There will be a beeping alarm when overspeed and the voltage and water temperature is abnormal to prevent engine failure in advance. Specifications: Screen size: 3inch Display Information: Speed, RPM, Fuel, Consumption, Voltage, Water Temperature, Trip Mileage, Trip Time, Total Mileage, Turbo boost, Oil Temperature Alarm: RPM Alarm #xff0c;Water Temperature Alarm #xff0c;Low Voltage Alarm #xff0c;Faulty Code Alarm Environment temperature: -40 #43;80 Atmospheric pressure: 86-106 KPa Environmental noise: lt; #61; 60dB (A) Alarm sound level: #61;30dB (A) Working voltage: 9V ~ 16Vdc (12Vdc / 400mA) Product size: 95x62x49mm Product weight: 60g Package size: 14.6 x 8.8 x 4.8cm / 5.75 x 3.46 x 1.89in Package weight: 170g / 6ounce Not applicable to OBD HUD models: 1. OBD American Models: Dodge, JEEP, Sail, Chrysler, models manufactured before 2004. 2. Not applicable to all French and Italian models. 3. OBD Japanese: Suzuki, Mazda 6, Infiniti (QX50 q50 q501), 2013 Toyota avanza, Lexus (is250, ex250, ES300H) Honda (jazz, CRV) and cars produced before 2008, etc. 4. Kia and Hyundai models (2013 Hyundai Sonata, 2017 Kia Soul PS, etc.) 5. Hybrid electric and diesel cars, pickup trucks, RVs, cars with modified computer, not suitable for HUD. Package List: 1 x HUD Main Unit 1 x OBD Cable 1 x User Manual 1 x Non-slip Mat