Feature: 1. Saveable Single Mileage: The default prompt is a single mileage, which will not be cleared when the power is off. Press and hold the rubber on the back for five seconds to clear the single mileage. The accumulated mileage will not be cleared if the power is off (the total mileage cannot be cleared). 2. Wide Application: COG is to display the direction of the ship's navigation, and display the position on the car. Suitable for a full range of stepping instruments, can be used for car, engine, boat, RV, yacht, engineering machinery, etc. 3. Durable Construction: Made of stainless steel and ABS, can be used in acid, alkali and humid environments, durable and have a long service time. Waterproof and dustproof grade, with curved glass, anti‑fog, no need to worry about the damage bad weather may cause. 4. Stable Performance: Low power consumption, long life and high accuracy. With ultra‑wide working voltage design, long‑term operating voltage is 9 to 32V, maximum can up to 36V. High and low temperature resistance. 5. Easy Installation: Install the caliber 85MM, and ensure that there is at least 55MM space behind the dashboard. The black wire is connected to the negative pole, and the other wires are connected to the positive pole. With a detailed manual, will clearly describe the installation, wiring and use functions. Specification: Item Type: GPS speedometer Material: Stainless steel + ABS Dial Color: Black, white Screen: OLED screen Dial Backlight Color: 7 color (can be adjusted manually, can be automatically switched) Signal: GPS Range: 0-200KM/H Installation Caliber: Approx. 85mm/3.35in, and ensure that there is at least 55mm/2.17in space behind the dashboardWorking Temperature: -30℃-+75℃ Storage Temperature: -40℃-+80℃ Applicable Scenarios: Universally used in automobiles, engines, boats, RVs, yachts, engineering machinery, etc.. Package List: 1 x Speedometer1 x GPS Receiver1 x Manual