OBDHUD M15 Head Up Display OBD2 Car HUD Speed Mileage Time Fuel Consumption Projector Auto Electronic Acceories Navigation HUD Product Highlights: 1:Turn ON / OFF automatically when the car is on / off.2: Speed unit: KMH (this version can not display MPH); Fuel consumption units L/H and L/100km3:Display Data: Speed, RPM, Coolant Temperature, Voltge, OBD Data Stream etc.4:Alarms:Over-speed Warning,High water temperature alarm, Low voltage alarm, Fatigue Driving alarm,Camera speed reminder...5:HUD display brightne will be adjusted automatically according to real-time environment.6: Different display interface, you can choose any display interface you prefer.7:Direction Navigation: Need to download WIIYII APP at first.More pictures: Please Read Carefully Before Buying: If you want to use the navigation function, please check below tips:1.Install APP:Before install the app, please change your phone language into English, then you can modify it to your local language after app installation is complete(Otherwise it will be shown in Chinese.2.Map: this device is using Mapbox, just part of google map. It can only show navigation direction, no brake reminder, no lane, which is different from normal GPS navigation in your phone.3.Language: device is Chinese and English only, but APP supports: English, Korean, Japanese, German, Spanish, Thai, Ruian...4.Usage: first time usage, please make sure your phone GPRS and GPS location are active, and Blue-tooth is connected according to the user manual. Bluetooth navigation function:navigation arrow direction,navigation lane,navigation speed limit distance,speed limit warning Product package list: 1* HUD body, 1* OBD data line, 1* reflection film, 1* anti-slip mat, 1* English Manual Navigation system use:Please in App store to download . or scan the below QR code to download and install.Steps as below.1.Confirm the APP installed succefully, and HUD is working.Open the mobile Blue-tooth,GPS,internet.Click the App,the mobile phone will auto connect with the HUD via Blue-tooth.2.If the mobile phone cannot connect to the Blue-tooth device correctly, please follow the instructions below:HUD host needs to display normally. If the OBD system is unable to connect, please switch to the GPS system,and display normally.Check the mobile Blue-tooth whether connected to other devices or not, if yes, please delete the paired Blue-tooth device, and connect to WYHUD3. Turn off the Blue-tooth and then turn it on, or restart the phone(for more questions, please refer to the troubleshooting)