Features:1.Automatic roll over.2.Resolution 0.1 Hour.3.Works on any gas engine.4.Records and displays to 9,999.9 hours.5.Stand-by Time up to over 20,000 hours.6.Connects to spark plug wire.7.Hour symbol appears and flashes to Indicate counting time.8.Easy Installation.9.Track the service life of your boat - oil changes, valve adjustments, spark plugs, ect…10.100% epoxy encapsulated casing.