1、By observing the data on the front window glass of the car to ensure the safety of the driver, and to help the driver maintain the best condition during driving. Multiple operation interface modes and colors can be switched freely, bringing you more fun and a sense of technology. 2、The OBD function can display speed, rotation speed, water temperature, voltage, fuel consumption, single driving distance, single driving time, 100km acceleration time, altitude, driving direction and clearing faults. 3、It has alarm functions, including overspeed alarm, speed alarm, fatigue driving reminder, voltage alarm, and water temperature alarm. Safty driving, keep your eyes ahead, no need to down your head to see dashboard while driving. 4、High‑definition display and practical functions make you more comfortable driving for a long time. Plug and play, all cars equipped with OBD2/USB interface can be used. 5、GPS function, for speed, altitude, time, single trip mileage, single trip time, voltage, number of satellites, altitude, driving direction.