Car 5.5 inch Head-up Display Windshield Projecter Digital Vehicle Speedometer Dual System Display Screen Overspeed Alarm Fatigue Driving Alarm for All Vehicles Note: This product working voltage is 5V. Features: Safe Driving: The head up display holder shows enough information directly to you, which allowing you to maintain constant focus on the traffic, with no extra distraction. Letting you see the navigation instructions clearly without lowering your head. Great Compatibility: It is applicable to all vehicles, such as cars, trucks, bus, fuel vehicles, trains, motorcycles, etc. Multifunction: This head up display can diplay speed, clock, acceleration time, driving distance per trip, driving direction angle, satellite numbers, altitude, longitude and latitude. Two Alarm functions: It supports overspeed alarm and fatigue driving alarm. Light Sensor: Head up display can automatically adjust the brightness according to the environment. Specifications: Shell color: black Backlight color: green, blue & white (optional)  Material: ABS Screen size: 5.5inch Operating voltage: ≤5V Vehicle speed display: display the current vehicle speed  Speed unit: MPH- mile, KM/H- kilometer Product size: 12.77 x 6.47cm  Package size: 16.5 x 7.5 x 6cm  Package weight: 200g  Packing List: 1 * G10 Head-up Display 1 * USB Cable 1 * Non-slip Mat 1 * Bracket Mout  1 * English User Manual