Features: 1.The brightness can automatically adjust by environment 2.Multi-function switch and use the newest upgrade hardware 3.Integrated shading design 4.Easy to install Specifications: Colour: Black Weight: 150 grams Size: 8.6x3.7x1.6cm Output frequency: 12V-24V Product name: HUD Car Alarms: Speeding, Fatigue Driving, Low Voltage Material: plastic, electronic components Cable length: 1.8M Function 1: Speed (km/h or mph 2: Water temperature (C or F) 3: Voltage 4: One-way mileage 5: Water temperature alarm 6: Voltage alarm 7: Shift reminder 8: Overspeed alarm 9: Fatigue driving reminder 10: Engine failure alarm GPS version: Compatible with all cars Scope of application of OBD2: The OBD2 agreement gasoline vehicles produced in the United States after 2004, and the OBD2 agreement gasoline vehicles produced in other regions after 2008. The following common models are not applicable to OBD2: Incompatible: American models: Dodge, JEEP, Sail, Chrysler, 2004 and before 2004 Incompatible: French and Italian models cannot be used: such as: Fiat, Maserati, Lamborghini, DS, Logo, Citroen, Renault, Simca, Amilka, etc. Incompatibility: Japanese models cannot be used: Suzuki, Mazda 6, Infiniti (QX50 q50 q501), 2013 Toyota avanza, Lexus (is250, ex250, ES300H) Honda (jazz, CRV) and cars produced before 2008, etc. Incompatible: South Korean Kia and some Hyundai models (2013 Hyundai Sonata, 2017 Kia Soul PS, etc.) Incompatible: gasoline-electric hybrid and diesel vehicles, pickup trucks, RVs, cars with modified car computers, Swiss Volvo, Chrysler Group, all brands of Fiat Group models. PackList:1*Digital Speedometer