• With OBD2 + GPS dual system, can work on all cars. If Your Car's OBD2 Protocol is incompatible, then you Can Choose GPS Working System, GPS mode can work with All Cars.
• Two installation methods:1) stand on dashboard, 2) upside down on windshield.
• Speed: KM/h & MPH switch freely.
Long press the middle OK button, enter setting page, press right button to System setting, and Press middle OK button again, and then come to Unit Switch, choose KM or Miles as you prefer.