Features: - SIMPLE & SAFE: Focused on the most important data: The speed, over speed alarm, driving direction, so that you can always keep your eyes on the road, NOT interfered by other gauge factors. - WELL PERFORMANCE :Provides digital speed just as you would expect from a digital speedometer at a very reasonable price. Car HUD Head Up Display Speed Warning is nice having both analog and digital without having to buy a vehicle based upon the type of speedometer it has. - SIMPLE & EASY OPERATION: this Car HUD Head Up Display Speed Warning was powered by car charger(Provided), Plug & Play, Car HUD Head Up Display Speed Warning no professional installation required. - Auto power on/off : Car HUD Head Up Display Speed Warning start and off with vehicle started and shutdown, Car HUD Head Up Display Speed Warning effective protection of the car battery; retaining the manual switch mode, more easy to control HUD. - Automatic and manual brightness adjustment mode, driving without glare. FULLY COMPATIBLE WITH all cars, vehicles & trucks. Specification: Type : Car HUD Head Up Display Speed Warning Screen size : 3.5 inch Speed range : 0-400KM Work voltage : DC8-24V Working current : 40mA car charger : 1000mA Sleeping current : 15mA Size : 90x54x12 mm Package Includes: 1 x Car HUD Head Up Display Speed Warning 1 x Car Charger Wire 1 x Reflection Paster 1 x Anti-slip Pad 1 x User Manu