Features： 1、Head up display can prevent the driver from being distracted because looking down at the instrument, brings fast traffic response. 2、OBD mode function, can shows vehicle speed, speed(RPM), water temperature, voltage,clock, single driving distance, single driving time, etc. 3、Can show warning icons like overspeed alarm, speed(RPM) alarm, fatigue driving alarm, water temp alarm, voltage alarm, engine failure warning. 4、GPS mode function, can shows vehicle speed, clock, voltage, single driving time, single driving distance, driving direction, altitude, number of satellites, speed diagram. 5、The display effect is better, and the driving information is more accurate, keep your eyes ahead to enhance driving safety. Specification： Item Type: Head Up Display Material: ABS Color: Black Size: Approx. 10.2 x 5.3 x 2.8cm/4.0 x 2.1 x 1.1in Compatible: Suitable for vehicles complying with OBD II standards GPS Mode Function: Vehicle speed, clock, voltage, single driving time, single driving distance, driving direction, altitude, number of satellites, speed diagram. Instructions: 1. Simply connect the head-up display (HUD) with the on-board diagnostic interface (OBD) through the OBD cable, and the head-up display (HUD) will display when the car engine starts. 2. Connect the USB cable to the USB interface, it will display when the car engine starts 3. GPS use method: Need to download for WiiYii APP software, wireless connection between HUD and smartphone via bluetooth, navigation information wil dispaly synchronously through APP. Package List： 1 x Host  1 x Sun Shield 1 x OBD Line 1 x USB Cable 1 x Anti-Slip Mat 1 x Reflective Sticker 1 x Manual