Speed odometer use stepping motor drive pointer, can show speed precisely, and also can show the mileage clearly with LCD display screen Specifications: Name:GPS Speedometer Material:stainless steel 316L bezel+anti-fog glass Panel color:Black Backlight Color: Red (default)? Green? Blue? White? Yellow? Yellow green? Orange? Purple? (Automatic). Totally 7 kinds different backlight color, it will change automatically every 1 minute, or you can fix only one color that you like through press the gauge back “set” button Fixing dimension: 85mm(3-3/8) Working voltage:932VDC Working current:? 100mA Operating temperature: -30°75° Storage temperature:-40°85° Levels of protection: IP67 Indicating Range: 040MPH Suitable for car truck boats off-roadvehicles boats.