1Suitable for all boats, yachts, vessels, vehicles and offroads vehicles . 2The signal comes directly from the satellites signal receiver(GPS antenna), don't need other speed sensor. 3The gauge has the advantages of high precision, quick location confirmation and short start up time. 4IP67 waterproof and dustproof grade, it can work in the water. 5Reverse polarity protection and antifogging performance, safer and dependable to use. 6Stepper motors used for full range of stepping gauges, great feature with its less power consumption, longer life, higher precision, etc.Condition: 100% Brand New Item Type: GPS Speedometer Material: Stainless steel + nickel-plated plastic Color: As picture shown Fixing Size: Approx.52mm(2in) Indicating Range: 0-999 (mph, Knots, Km/h Adjustable)Switch Unit Between Mph(mi), Knots(nmi) and Km/h (km) by Backside ButtonTrip Counter Working Voltage: 12V / 24VGPS Blind Area Odometer Compensation Working Temperatures: - 40 - 85 Operation Mode: LCD Display, Stepper Motor }1 x GPS Speedometer1 x GPS1 x Connect Cable1 x Manual