Features: 1. Five alarm functions: overspeed alarm, speed alarm, voltage alarm, water temperature alarm, and driving fatigue alarm. 2. Function: vehicle speed, water temperature, voltage, fuel consumption, 0-100km/h acceleration test. 3. Automatic photosensitive mode: The photosensitive element can automatically adjust the brightne of the display screen according to the intensity of the outside light, so that it is clearly visible under strong light. 4. Vehicle performance test: 0-100km/h acceleration and driving distance test, let you know the vehicle performance status. 5. This product is only applicable to gasoline vehicles with OBD2 protocol Product parameters: Model: B1 Material: ABS+metal Colour: Black Light color: white Screen size: 2inch Product size: 63.8x61.7x47.1mm Scope of application; Scope of application of OBD2 models: gasoline vehicles with OBD2 agreement produced in the United States after 2004, and gasoline vehicles with OBD2 agreement 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 3, 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, Swi Volvo, Chrysler Group, all brands of Fiat Group models. Packing list: HUD*1+Instructions*1+Anti-slip pad*1+OBD line*1