?Specially remind?Compass work needs to meet the following 3 conditions: 1. GPS positioning successfully. 2. The compass can only work normally while the vehicle is in motion. 3. Driving your car, the compass direction is the car driving direction. ? Safety Use ?The case is made of ABS+PC, which is high temperature resistant anti-fire material. No built-in battery, no explosion/no burning hazard under high temperature. ? Universal for all vehicles?Can be widely used on car, truck, bus, pick-up, van, train, boat, SUV, golf cart, scooter, electric-car, new energy vehicle, HEV, BEV, FCEV… no matter which brand or which model all over the world cause C3010 is based on the GPS module inside, no worry about the compatibly. ?USB Cable Plug & play?Power (5V) through USB port, no professional installation is required. Connect it with USB cable (in our gift box), then connect it to your car USB port or car adaptor, it can work directly. When car is on, it will be on; when car is off, it will be off automatically. ?4.2'' Clear LED screen?C3010 HUD is equipped with a high definition 4.2'' LED screen, which displays the information more clearly than the windshield HUD. The light sensor enables auto-adjustable brightness for day & night-time driving. Also the big and green color fonts makes more easier and comfortable to read. ?7-in-1 HUD?Vehicle driving speed, Driving direction by compass, Driving time calculation, Driving mileage measurement, Over-speed alarm, Fatigue driving warning, freely switch between kilometers and miles.