Aimilar Digital Inductive LCD Engine Hour Meter Waterproof for Motorcycle Black This small engine hour meter track the service life of your engine - oil changes, valve, adjustments, spark plugs, etc... No power required- sealed waterproof lifetime battery Easy installation-peel and stick,no wiring necessary,or attach with enclosed hardware Works on any gas engine. Hour glass symbol appears and flashes on/off to indicate counting time. SATISFACTION GUARANTEED: 30-Day money back and 2-Year warranty.