Supply voltage: 9~36VDC Speed indication range: 0-125km/h Installation Size: 140mm Speed ratio range(pulse/km): 1000-65535 Operating temperature range: -40C ~ +85C Odometer indication range: 0-999999.9 Light Color:Yellow Functions 1. Odometer A. Total mileage programmable. B. Trip Counter, and support reset the indication of the trip odometer to zero. 2. Calibration (imp/km) Programmable. The Calibration is programmable, so that many trucks can use this device. 3. Overspeed Buzzer Alarm For example, the Overspeed Alarm value is set to 100KM/H, when the truck's speed passes this value, then the Buzzer alarm with very big voice. The Overspeed Alarm Value is programmable. Note: The GPS speedometer can be used in of automobiles, large and small ships, yachts and speedboats, etc. It can accurately measure the travelling speed and mileage of vehicles and ships by connecting the satellite signal antenna externally. The instrument has the features of high precision, fast positioning time, short cold start time, waterproof and anti-fog. Color: Black Material: ABS Package Contents: 1 x Speedometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.