Feature:1. Wide range of application, suitable for ships, yachts, trucks, commercial vehicles, construction machinery.2. Stainless steel material, water resisting, sturdy, has long service life, not easy to damage.3. Can freely switch the speed unit of kont, mph, km/h, which is convenient for you to watch and provides you with more convenience.4. The navigation pointer supports 8 direction pointers, bringing you more convenience.5. Small, light and easy to install, no other complicated steps are allowed, bringing you more convenience.Specification:Item Type: SpeedometerMaterial: 316 Stainless Steel and ABS and PCInput ParametersGPS SignalWorking Voltage: 9-30VDCWorking Current: andlt 100mAWorking Temperature: -20-70Storage Temperature: -30-80Proof Rating: IP67Wiring Connection: 1. Black Line: Negative Power Supply (-)2. Red Wire: 9-30VDCDisplay Function:SOG: Ground SpeedTRIP: Single Mileage, Cleared when Power OffODO: Accumulated Mileage, Saved when Power OffCOG: Heading, Clockwise Angle of True NorthBattery Voltage: 9-30V (Not Inclouded)Navigation Pointer: 8 DirectionsCan freely switch Kont, mph, km/h speed Units.Dial Diameter: Approx. 9.6cm or 3.8inInstallation Diameter: Approx. 8.5cm or 3.3in.Package List:1 x Speedometer1 x Instruction1 x GPS Antenna Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.