Features: 1. Multifunction HUD: This HUD displays vehicle driving speed in real time and shows driving direction, single trip time, and single trip mileage using the built-in compass. 2. High Accuracy: Accurately acquires satellite count, speed, and compass data from GPS satellites with timely and precise performance. The compass direction is not affected by magnetic fields. 3. Alarm Function: Includes overspeed alarm and fatigue driving reminder to enhance driving safety. Default setting is 120 km/h or 120 mph, adjustable according to user preference. 4. 3-inch Screen: Large screen with clear, green digital display for easy and comfortable viewing. Green lighting helps reduce eye strain, ideal for long-distance driving. 5. Universal Fit: Obtains speed data via GPS satellites, independent of the vehicle's engine system, making it compatible with various vehicles including cars, trucks, pickups, SUVs, scooters, bicycles, and boats. Specification: Item Type: HUD Display Material: ABS, Metal Display Size: 3 inch Functions: Speed Display Single Trip Mileage Driving Direction Satellite Search Supports KM/H and MPH Switching Alarms: Speeding Alarm, Fatigue Driving Reminder Compatible Vehicles: Cars, SUVs, Trucks, RVs, Vans, Buses, Motorcycles, etc. Package List: 1 x HUD Display 1 x Power Cord 1 x Mounting Bracket 1 x Sticker 1 x User Manual Note: For proper operation, the following conditions must be met: 1. GPS positioning must be successful. 2. The compass function operates only when the vehicle is in motion. 3. While driving, the compass indicates the direction of travel. Important: This device operates at 5V. Do not use a power source exceeding 5V.