1Multiple Functions: Display speed, single distance, driving direction, overspeed alarm, fatigue driving reminder, switch between kilometers, automatic brightness adjustment. 2Clear and Intuitive Display: The small size of 2.6 inches avoids blocking the driver's view; it displays clearer information than the Hud on the windshield, allowing you to monitor the speed more comfortably. 3Overspeed and Fatigue Driving Alarm: Default setting is 120KM/H or 120MPH. You can adjust it according to your needs. When it detects speeding, it will beep to remind the driver. 4Universal Fit: Powered by the on?board cigarette lighter, the actual and instance speed is displayed via Gps satellites. Built?in Gps module, so it can be compatible with most car brands and models. 5Practical Tool: Ce Fcc RoHS certification, ensure product quality. Suitable for cars, motorcycles, SUVs, vans, RVs, buses, and practical tools to bring more fun to your driving experience.