Suitable for all vehicles, boats and off-road vehicles. The signal comes directly from the satellite signal receiver,the gauge has the advantages of high precision, quick location confirmation,short start up time and easy to setup. Installation dimension: Φ 85 mm, Connector: multi-plugs socket connection, Background light: Red or Yellow. Indicating Range:0~999 Knots, Working Voltage:12/24 V. Can choose between units displaying in km/h, knote, mph. Signal: GPS. Protection grade: IP7; can work up to 1 m under water. Color – white.