gftHBFgkl Head-up Display - Car GPS Digital Speedometer

Warning: Speed Unit - KM/H: Kilometer per hour. - MPH: Mile per hour. The speed unit is fixed.Before placing an order, please choose the right speed unit. Compatible With: All Car Models with USB Port. Description: 6. Power Supply: Car USB Port or Car Cigarette Lighter Port (Input Voltage: DC 5V); 7. Function: GPS Speed, Automatic Brightness, to Play. How to Install (First Use) 1. Noted: Before installation, drive your car in an outside place, not in garages or indoors, and then open your car window; 2. the USB cable into your car USB port or car cigarette lighter ports, and the other end to your device; put it on the dashboard, and stick the reflective film on the car windshield glass; 3. Turn on your car, it will take about 1-3 minutes to search for the signal; 4. When "0" appears, it is successful to install; driving your car on the road, it can read your real speed data; 5. Unplug the cable, the device will turn off. ========== Size Name : 70*42.8*20mm / 2.76*1.69*0.79inch Wire or Wireless : Wired Power Supply : Car USB Port Input Voltage : DC 5V Function : GPS Speed, Automatic Brightness, Play Light Color : Green, White (Optional) Speed Unit : KM/H(Kilometer), MPH(Mile, for US/UK) Warning : The speed unit is fixed. Before placing an order, please choose the right speed unit.