for Key Information Display: Head-up display the speed. Display MPH or for KM/h Driving for Time Distance Calculate and Display let you know the for key information for your trip Green Light Display: Green light display will protect eyes of driver ,let driver feel more comfortable, especially for long distance driving. Safe Alarm: Overspeed Alarm & Fatigue Driving Alarm to ensure your safe in long distance driving. Screen size: 3.0inch Features: 1.Safe Alarm: Overspeed Alarm & Fatigue Driving Alarm to ensure your safe in long distance driving. 2.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), for all for cars & trucks; 3.Non-skiding: With a rotatable holder & strong sticker stand, can fix HUD on your car console or windshield, prevent the HUD from skiding. Shipment includes: 1*GPS HUD Speedometer Odometer 1*Connecting line 1*Mounting bracket 1*Instruction