5.5 Inch Car HUD Projector Head Up Display OBD II This is the device that projects important data onto the windshield directly in front of a drivers line of sight, enabling continuous road awareness. Features: Automatic adaptation models, in line with OBD II or EUOBD (car auto diagnostic system) models Plug Read to use. Vehicle speed, engine speed, water temperature (voltage / throttle position / ignition advance angle/ 100km acceleration), fuel consumption, mileage, low fuel tips, rest tips, engine failure, displayed simultaneously. Normal display mode, high-speed display mode, automatic display mode can be chosen. Km miles freely switch, which greatly facilitates Inch Auto Meter. 5.5 inch display area, more conducive to the data read Switcher, launch vehicle, lorry shutdown, effectively protect the car battery; while preserving the hand switch machine way more beneficial to control the HUD. Speed single-stage and four alarm modes, more conducive to driving safety. Speed alarm, there is conducive to the timely shift to achieve the purpose of saving the novice also has a special significance. Automatic and manual brightness adjustment mode, not dazzling. Specifications: Ambient temperature: -40C~ 80c Atm: 86-106KPa Relative humidity 10%~95% Ambient noise