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 that meet OBD II standards GPS Mode Function: Displays 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) using the OBD cable, and the HUD will activate when the vehicle engine starts. 2. Connect the USB cable to the USB interface, and the display will activate when the vehicle engine starts. 3. For GPS usage: Download the appropriate APP software, establish a wireless connection between the HUD and smartphone via Bluetooth, and navigation information will be displayed synchronously through the APP.