Feature:1. Multifunction instrument, speedometer KM/H+GPS, can shows total accumulated mileage, save the total mileage when power off.2. Made of high quality 316 stainless steel + mirror tempered glass material for good durability, excellent seismic performance.3. IP67 waterproof level, suitable for boats, yachts, outboard motors, automotive engineering machinery, motorcycles, etc.4. GPS ship speedometer has lower power consumption, longer life, higher accuracy, fast position confirmation, and short startup time.5. Open the 85 mm (3 3/8 inch) hole on the dash and leave a 55 mm (2 3/16 inch) behind the panel, put the meter in and fix it.Specification:Item Type: GPS SpeedometerMaterial: ABS+316 Stainless Steel + Mirror Tempered GlassIndication Range: 0-30KM/H Installation Diameter: Approx. 85mm/3.3inWaterproof: IP 67Wiring:Black: Ground (-)Red: 9-30V DCYellow: Backlight.Package List:1 x Multifunction Speedometer1 x GPS1 x English Installation Instructions