Features: Track the service life of your vehicle-oil changes, valve, adjustments, spark plugs, etc. Easy installation-peel stick,no wiring necessary,or attach with enclosed hardware. No battery required-connecys to spark plugs wire. Works on any gasoline engine. Records and displays to 9,999.9 hours.stand-by time up to over 20,000 hours. Hour glass symbol appears and flashes onoff to indicate counting time. Automatic roll over Resolution 0.1 hour. 100 epoxy encapsulated casing resists water,shock,stand fire of 85 celsius degree Specification: Quantity: 1 Material: Resin Plastic Type: Electronic Gadgets Track the service life of your vehicle-oil changes,valve,adjustments,spark plugs,etc. Easy installation-peel stick, no wiring necessary,or attach with enclosed hardware Works on any gas engine Records and displays to 9,999.9 hours. Hour glass symbol appears and flashes on off to indicate counting time. Automatic roll over Resolution: 0.1 hour Temperature: -30-85 degC Built-in 1 x CR2430 battery 1.0 LCD screen display Waterproof material Package List: 1 x Hour meter 1 x Cable 110cm 2 x Screws