Safe driving, keep your eyes ahead, no need to lower your head to see the dashboard while driving Nano-technology to eliminate double reflections, more clarity Easy to install, just connect the HUD to the car OBD port by OBD cable, the HUD will display when the car engine turns on/off Overtime driving alarm, low voltage alarm, overspeed alarm, high temperature alarm, engine failure alarm Switch and MPH freely. Compatible with: OBD II compliant cars (after 2007 years) (cars, pure electric cars, hybrid cars can not be used) Installation position: on the center console Connection: Connect with the car OBD port Display information: speed, RPM, temperature voltage, single driving distance, low voltage alarm, high temperature alarm, overspeed alarm, freely switch between kilometers and miles. Multicolor makes the screen clearer and easier to read 5-level brightness adjustment, automatic and manual brightness adjustment mode short pull up to switch display modes: mode 1: Speed + RPM mode 2: