Features: The product is developed for safe driving of auto. When an auto is at high speed, especially at night, if the driver lowers his head to watch meters or audio display, he will not take effective measures in time when some emergencies appear suddenly. At that critical time, Activesafety HUD reflects very exquisite care by projecting the important information of meters display on front windshield in auto moving, such as speed. Not only does it helps new driver of less experience to control the speed to avoid overspeed in some speed limit road section, but also it makes the driver read the data rapidly without transforming vision and keep the best watch state sobermindedly. Driving speed, driving time, overspeed alarm, automatic vehicle location (electronic compass), altitude, dormant and other parameters will be displayed on the windscreen. Such as the above, remind the driver to pay attention to the traffic information for safe driving. Specifications: Working voltage: DC8-18VWorking current : 40mASleeping current: 15mACompass precision: -1 degreeSpeed range: 0-400KMReal time precision: The same as satelliteCircuit protection: Reverse voltage, surge protectionSatellite positioning time: Cold start: 30s, hot start: 1sHUD size: 99mm*90mm*23mm12V car charger: 1000mAUSB cable: 1mWeight:105g