Hour meter use epoxy encapsulated case is water resistant, can withstand interference and high temperature. Integrate tachometer and hour meter in one, work on any gasoline engine. It uses LCD display, self-powered design (not afraid of power loss). Life tracking of vehicle oil systems, valve, settings, spark plugs, etc. Easy installation - peel and stick, no wiring required, installation with the included wire and mounting screws. Easy to use: you just need to put the hour meter on the equipment surface when the vibration and movement, then, the timer icon starts flashing, it means working, you can know the equipment working time. Remark: Recorded time cannot be erased. Hour Meter use for Marine, Motorcycle, Quad, Snowmobile Motocross, Pit Bike, Lawn Mower, Tractor, Truck 1.Easy installation - peel and stick, no wiring required, install with included wire and mounting screws. 2. Easy to use: you just need to put the hour meter on the equipment surface when the vibration and movement, then the timer icon starts flashing, it means working, you can know the time of equipment work. Remark: The recording time cannot be erased. Feature: Material: high quality epoxy Size: 5.5 x 3.6 x 1.5 cm (L x W x H) Color: black Package included: 1 x Hour meter Good Tips Different lighting and display may cause a slight color difference between the product and the actual product. Measurement tolerance is +/- 1-3cm