Features: The product is developed for safe driving of automobiles . When a car is at high speed, especially at night, if the driver lowers his head to see the gauges or audio screen, he will not take effective measures in time when some emergencies appear suddenly. At that critical moment, Activesafety HUD reflects very exquisite care in projecting the important information from the meter display on the front windshield onto the moving car, such as speed. It not only helps the new driver with less experience to control the speed to avoid speeding on some section of the road with speed limit, but also makes the driver read the data quickly without transforming the vision and maintain the best state of sober vigilance. Driving speed, driving time, speeding alarm, automatic vehicle location (electronic compass), altitude, inactivity and other parameters will be displayed on the windshield. As the above, remind the driver to pay attention to traffic information for safe driving. Specifications: Working Voltage: DC8-18VWorking Current : 40mStanding Current: 15mAccuracy of Compass : -1degreeSpeed Range : 0-400KMPactual Time Accuracy :Same as SatelliteCircuit Protection : Reverse voltage, surge protectionSatellite positioning time : Cold start: 30s, hot start: 1sUnit size : 99mm*90mm*90mm*23mm12V car charger : 1000mUSB cable : 1mWeight :105g.