Description: HUD short for head up display.It displays driving dates on the front windshield such as speed,RPM,water temperature,voltage,single mileage etc;to avoid drivers unsafely because of watching the instrument while driving. Bidirectional USB interface: This product has a dual-directional USB interface, two interfaces can be selected at will, which is more convenient. 16 kinds of interface display: This display can manually set the driving data you need to display, and the independent button button can switch the mode you want, such as profile mode, standard mode, speed icon, etc. This product can set different parameter over-limit alarms, such as over-speed alarm, fatigue driving reminder, etc., which can improve driving safety. It can adjust the brightness and adjust the brightness as needed to make it display more clearly. 3.5 inches screen , using metal nanotechnology, which can eliminate unnecessary reflections and make the screen display clearer. Specification: Type: Car monitor Color: Black Material: ABS+PC Standby current: ~0.002 mAh Atmospheric pressure: 86-106KPa Environmental noise:<=60dB(A) Working voltage: 11V~16Vdc (12Vdc/400mA) Product size:90X55X30 mm/3.54X2.16X1.18 inch Package Includes: 1x Car Monitor 1x OBD Line 1x Reflective Film 1x Non-slip Mat 1x Instruction Note: Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!