Car head up displays improve safety by simply focusing on driving and reading the vehicle speed through digital numbers at a glance, without the need to look down; No matter which angle it is set, this device can display directly without any effort to view, so as not to distract attention and even cause accidents. There are 2 systems, 12 English languages, 6 display screens, and 6 themed ambient lights that can be switched with just one click. You can also customize your speed unit, temperature unit, brightness level, etc. according to your country's habits. F11 is not just an OBD instrument, but also a safety recorder. We have introduced a driving scoring system to accurately record the driving behavior of each trip and provide reference warnings in the form of scoring. Help drivers develop good driving habits and provide protection for every trip. Driving is more comfortable. Our speedometer has overspeed alarm, RPM alarm, water temperature alarm, and voltage alarm Fault alarm, slope tilt alarm function, OBD2 adopts ambient light alarm design. If there are driving abnormalities such as speeding, the red flashing alarm light will be displayed to indicate a warning. Stronger signal, compatible, built-in GPS and Beidou chip module, compensating for the shortcomings of OBD system, USB power supply, plug and play, suitable for all vehicle models. The OBD system can read over 100 types of data inside the vehicle. If the vehicle does not have OBD2 protocol, only GPS function will be displayed.