Note: This product working voltage is 5V. 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 HUD 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: HUD 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