Overview: This product is for drivers' safety, at high speeds, especially in high-speed driving at night, in order to avoid the driver to look down their head to watch the instrument, and decrease car accident.  HUD can project the important information displayed by the instrument (such as speed) onto the windshield,  It can not only to help determine the speed of inexperienced novice to control their speed and avoid many of the speed limit road due to speeding violation. More importantly,  It enables the driver instantly read the number in great vision and always make drivers eyes on the road in clear mind.   Features: Color LED screen highlighting Lossless installation Plug and Play;  Self-contained hood display, blackout integrated design, clearer display, no glare;  Rich data display: driving speed, water tank temperature, battery voltage, automatic power on/off, driving mileage, mileage switching, detection and removal of vehicle error diagnosis code, no need for professional equipment to eliminate;  Overspeed, low voltage, high temperature, high temperature alarm;  3 display modes (standard mode, compact mode, competitive mode), 9 display screens with one button;  Start with the car, sleep with the car, effectively protect the car battery, and keep the manual switch machine. It is more beneficial to control the HUD.   Specifications: Screen size: 3.5inch;  Product size: 90*53*26mm;  Ambient temperature -40C - +120C atmospheric pressure 86 - 106KPa;  Relative humidity 10% - 95% Ambient noise <= 60dB (A);  Working voltage: 11V~18Vdc (12Vdc/200mA);  Standby current: about 20mA;  Product Certification: CE ROHS FCC;  Packing size: 14.6*8.8*4.8cm/5.75*3.46*1.89in;  Package weight: 170g/6oz;   Package list: 1*HUD Host;  1*OBD line;  1* Non-slip mat;  1* Reflective film;  1* Instruction manual