HUD Digital Speedometer for Car Universal Heads Up Display Oversize Screen Large LCD MPH Speed Fatigued Diving Alert Over Alarm Compass All Vehicle

Professional Scheme Design: High-performance processing chips and dual-core processors ensure smooth high-speed operation. Dual-running memory enhances performance and compatibility. Core algorithms add speed lubrication effects, ensuring a coherent and smooth display. 0 Power Consumption: Powered by car USB (5V) or cigarette lighter, minimizing power consumption. Caution against using voltage over 5V to prevent damage. Dual-mode Chip: Adopts a 10Hz high refresh rate BeiDou dual-mode chip. 10 frames/sec refresh rate for smooth and accurate speed. Accuracy rate up to 99% with normal signal reception. Brightness Auto-sensitive: Automatically adjusts display brightness according to external light conditions. Ensures the clearest data whether in daytime or nighttime driving. Synchronized with Car: Synchronizes with car start and shutdown. Disconnects completely from the car when switched off, preventing power theft. Safety Driving Alarm: Overspeed alarm with adjustable settings (100MPH/150MPH/200MPH). Continuous driving time alarm set at 4 hours (adjustable from 1-8). Default values can be changed manually. Calibration Feature: Offers the ability to calibrate speed and distance readings to match factory gauges. Potential for a slight error (around 1%) after calibration.