@dr.foryours: Adjustable Brightness: Features multiple brightness levels to ensure visibility in both day and night conditions. Dual GPS Technology: Utilizes dual-mode GPS + BDS with a 10Hz refresh rate for fast, stable, and accurate speed updates. Overspeed Alert: Automatically alerts when your vehicle exceeds a preset speed limit to enhance driving safety. Plug & Play USB Power: Easily install by plugging into any vehicle USB power source for convenient use. Speed Calibration: Includes a feature to manually adjust speed calibration for improved accuracy. Speed Unit Switch: Allows you to effortlessly switch between MPH and KM/H to suit your driving needs.