Features:1.Round Shape 6 digital display hour meter.2.High Accuracy and Steady Performance.3.Waterproof and Easy To Read.4.Voltage Supply 10 to 80 Volts DC.5.Display range: 0-99999.9 hours6.Accuracy ±0.01.7.Temperature Range -10℃--50℃.8.Power Consumption 0,3W.9.Track the service life of your boat - oil changes, valve adjustments, spark plugs, ect…10.100% epoxy encapsulated casing resists water.Size:Hole Size: 2 inch(51 mm).Outside Diameter: 2.3 inch(58,5 mm).Depth Behind the Panel :1.7 inch(43 mm) - plugs included.