Some models need to adjust the agreement number according to their own models according to the following screen adjustment.1. Turn the pulsator back and keep it still, it shows 30 let go.2. Dial forward to item 32, short press in the middle to view the OBD protocol number, and then short press to exit.3. After dialing to 30, short press in, and dial forward to adjust to the OBD protocol number just seen.4. Long press the impeller to the middle to save and exit.Car HUD OBD2 Head-up Display Windshield Speed Projector Speedometer Windshield KMH/Mile Water TEMP VoltmeterFetures:Smart size, the length is only 8.6CM Simple display. Speed display & Alarm , Voltage display, Water temperature display,KM/H & MPH, Voltage.... Easy to Install Quality & Price reasonable Specifications:Product Name: s-Mini HUD (Super mini size HUD) Unit size: 86.5*37*14.5mm Weight:150g Screen size:3.2inch Working voltage:11V-16V Working temperature: -40 to 120 degree Pressure:86-106kpa Color: Black Display color: WhiteShine LED Bulbs:Smart HUD designed with High quality of LED Bulbs, keep display more shine and clearly...