?Certification and after-sales service?All of our products have CE/FCC/ROHS certification, so you can use the products with confidence. If you encounter any difficulties in the process of use, please consult us, we will help you solve the problem. ?GPS System Functions?Speed/Time/Mileage/Single Trip/Time/Single Trip/Voltage/Satellite Count/Altitude/Driving Direction. ?OBD system Functions?speed/rpm/water temperature/voltage/fuel consumption/single trip mileage/single trip time/100km acceleration time/altitude/direction of travel/clear fault. ?Compatible Details?This product is a dual system OBD+GPS product.OBDll is suitable for vehicles manufactured after 2008.GPS model is suitable for all vehicles.OBDll model is not compatible with hybrid electric cars, diesel cars, pickup trucks, saloon cars, computer modified cars.GPS model is recommended. ?What is HUD? Short Head Up Display. It displays driving data on the front windshield such as speed,RPM,water temperature,voltage single mileage etc. HUD avoids the danger of drivers looking down at the dashboard. It ensures the safety of drivers because of watching the data on the car front window glass, and helps drivers to keep the best state on the way. A variety of operating interface modes and colors can be switched freely, It will bring more fun and Technological sense to you.