HUD can display driving datas on the front windshield such as speed, RPM, water temperature, voltage, etc. on the car front window . The driving information can be read instantly by the driver, and keep a perfect state on the way with HUD. Avoids the danger of the driver looking down at the dashboard, which ensures the driver's safety and helps the driver stay in top condition. Features: Multifunctions: speed, RPM, water temperature, voltage, fuel consumptionengine speed, driven distance display. Alarm: overspeed alarm (single-stage alarm/four-stage alarm), excessive water temperature alarm, fatigue driving reminder, over-low voltage alarm, speed alarm, fault code detection, fault code elimination. 3.8-inch large-screen metal nanotechnology. The front adopts metal nanotechnology to eliminate unnecessary reflections and make the picture more clear. Automatic brightness adjustment. Strong light makes it pretty clear in the sunny day,rainy day. GPS system: GPS flashing is in the state of searching for stars. Please move the car to an open road. After the satellite is found, the GPS light stops flashing and stays on for normal use. PC material, high and low temperature resistance. Specifications: Item type: Car HUD Display Model: M16 Material: ABS+pc Screen size: 3.8inch Environment temperature: -40~+80 Environment voice: <=60dB Work voltage:11V~16Vdc(12Vdc/400mA) Reflector transmittance: 98% Item size: 90x53x26mm Package weight: 230g Package size: 14.3*9*5.1cm Package list: 1 * Car HUD Display 1 * GPS cigarette lighter 1 * Reflective film 1 * Manual 1 * Non-slip mat