1Multi Functional: Displays a variety of functions including Gps speed, driving direction, over speed alarm, and more. Automatic switch between km/h and Mph for convenient control. 2Automatic Light Adjust: Built in light sensing system, which could adjusts screen brightness for comfortable viewing experience during the day or night. 3Driving Safety: Mounted on the dashboard, does not block your view for easy and safe driving. Displays speed and direction without having to look down while driving. 4High Precision: The Hud speedometer gauge adopts Gps and for BeiDou dual mode chips, which could provide fast refresh speed and no delay while operating. 5Non Destructive Installation: The package includes a pair of double sided tapes, which can firmly fix the gauge on the dashboard, easy for installation and disassembly.