Product high lights:1)Keep your eyes on the road:At 65 mph, looking down for one second to check the speedometer means driving blind for 95 feet. Many accidents start during the time a driver glances down and fails to see sudden traffic changes ahead. Drive safely by never looking down to check speed.2) Know yourreal-timespeedVJOY HUD uses GPS to determine theReal-timespeedof the vehicle. There are several reasons why there may be a difference between the speed displayed on the car"'"s speedometer and the HUD. These include: Calibration set by vehicle manufacturers to read high to ensure their speedometers never indicate a lower speed than the actual speed of the vehicle. Speedometer inaccuracy due to aftermarket modifications such as different tire and wheel sizes or different differential gearing. C80 Photo: Over-Speed Alarm in Bi Bi Bi Real Time Speed From GPS Satellites Install Guide for Bike Users it"'"s without internal battery, don"'"t forget to give it a power bank.Auto Adjust Brightness Sensor For Day & Night Driving Package ListC60 photo: C60s photo Main Feature: 1.Head-up display2. Total driving time and distance calculate and display3.Easy Setup-Plug & Play- Power through Vehicle Cigarette Outlet Jack, No professional installation is required.4.Compatible with All Cars & Trucks. Use GPS Signal Guided Calculation, No wiring needed to the VSS (vehicle speed signal).5.Display MPH or KM/h - Simple Push Button Set up.6.Auto Adjust Brightness thru Sensor for Day & night-time Driving.7.Vehicle Driving Speed Display, Green Color Speed Display, easy on your eye.8.Over Speed Warning Setting -- Alarm Mute Function.Over-speed warning: a 3 seconds alarm beep and keep flash display will keep warning driver.9) . Car adaptor cable:180cm10). Altitude dispaly -input voltage: DC5V-12V-Adapter voltage in: DC12-24V-Current draw: 450mA-Speed Ranges: 0-158MPH / 0-255Km/hrTwoScreen display Modes Mode A: Single Display Mode - Only speed in full screenSlide the toggle switch up and hold to see the driving speed only, repeat to see full information display.Mode B: Multifunctional Display Mode -Speed, Single Driving Time, Single Driving Mileage, and Car Voltage.Slide the toggle switch down and hold to see time display at the bottom right corner, repeat to see altitude display. Factory Show:VJOYCar factory has around 200 workers, very good quality control; all products have CE certification, make your orders pass through the custom without any troubles. If you need the detailed CE certification or reports,please contact with us directly. If you are not satisfied when receive the order, or need any assistance when usage, please don"'"t hesitate to contact with us.If you are satisfied with our products and service, please kindly leave us 5 stars