Geyiren M8 OBD2 HUD Head-up Display Car Digital Speedometer Smart System Speed Mileage Water Temp RPM Projector for Car Glass Product Features: 1. Geyiren CAR 100% Brand Guarantee 2.Safty driving, Keep your eyes ahead, No need to down your head to see Dashboard while driving 3.Nano-technology to eliminate double reflections, more clarity 4. Easy to Install, Only need connect the HUD with Car OBD port by OBD cable, HUD will display when car engine on / off 5. Over-time driving Alarm, Low Voltage Alarm, Over-speed Alarm, High temperature Alarm, Engine faulty Alarm 6. KMH & MPH Switch Freely. 7. Compatiable for: Cars in OBD II Standard (after 2007 years)Diesel cars, pure electric cars, hybrid cars cannot be used 8. Installation position: On Center Console 9. Connection: Connect with Car OBD port 10.Display information:speed, RPM, water temperature, voltage, single driving distance, low voltage alarm, high water temperature alarm, over speed alarm, freely switch between kilometers & miles. 11.Multi-color design makes the screen clearer and easier to read 12. 5-level brightness adjustment, automatic and manual brightness adjustment mode short pull up to switch display mode mode 1: Speed + RPM mode 2: Speed + Water Temperature mode 3: speed mode 4: Speed+ RPM + Water Temperature Package List: 1* HUD body, 1* OBD data line, 1* reflection film, 1* anti-slip mat, 1* English Manual Screen size:3.5 inch Product size:90x54x12 mm Product weight: 40g The speed on the windshield No longer look down to check the speed, driving is safer Please read carefully before placing an order: 1. If your car is pre-2004 (for US automakers) and pre-2008 (for European/Asian automakers), the protocol is not compatible. 2. After receiving the package, please test it on your car as soon as possible. If you do not want to keep the device after testing, you can also