Safe Alarm:Overspeed Alarm & Fatigue Driving Alarm to your safe in long distance driving.(The details pls refer to "Product Description Section").Key Information Display:Head-up display the speed, or KM/h, Driving Time and Distance Calculate and Display,(C60 with Windshield Project Display),( C80 C90 with Altitude Display, Car Clcok), let you know the key information for your trip; Green Light Display: adjust brightness through sensor for Day & Night driving. Green light display can protect the driver's eyes ,let driver feel more comfortable.Plug & Play:This HUD caculate & display the real-time speed via GPS. No Need professional installation, No wiring needed to the VSS (vehicle speed signal), Compatible with all & trucks,(C80 also Compatibale with motocycle & bicycle); Non-skiding:C60 with Non- mat, C60S & C80 & C90 with a rotatable holder & strong sticker stand, can fix HUD to your car console or windshield, prevent the HUD from skiding. Display Effect In Day.Green color speed display;Big number display, your eye.Dispaly Effect In Night. adjust brightness through sensor for Day & Night driving.Head-up display Universal GPS Head-up display, compatible with all & Trucks.With a rotatable holder and a strong sticker stand, can fix HUD on your car console or windshield, prevent the HUD from skididng. Mian Features Keep your eyes on the road At 65 , looking down for one second to check the speedometer means drivingblind for 95 feet. Many accidents during the time a driver glances down andfails to see sudden changes ahead. Now, drive safely by never looking downto check speed again. 1) Head-up display 2) Driving time and mileage calculation and display 3) Easy Setup--Plug & Play---Power through vehicle lighter. No professional installation is required. 4) Compatible with all & Trucks. Use GPS signal guided calculation. No wiring needed to the VSS (vehicle speed signal). 5) Display or KM/h (The default speed unit is KM/To switch it to , IV. in Operation Guide. ) 6) adjust brightness through sensor for Day & Night driving. 7) Vehicle driving speed display. Green color speed display, your eye. 8) Over-speed Alarm setting (On/Off Optional)Overspeed default setting is 120KM/H or 120MPH. Just need press the "up" or "down"to adjust it. When over-speed alarm is active, it will beep in 3 to alert the car driver. Colour: Black Material: ABS+PC size:11.5*6.5*7CM Package Contents: 1pcs*GPS HUD Speedometer 1pcs*usb cable 1pcs*plastic holder 1pcs* manual 1pcs*box Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.