Specifications: It adopts low-voltage design and has a built-in battery, which has long-lasting power, it is safe and reliable, and it has a service life of 2 to 3 years. Hour meter is widely used in ordinary car, mini car, off-road vehicle, ordinary racing car, mini racing car, off-road racing car, motorcycle, ATV, motor boat, lawn mower, chainsaw and surfing boat, etc. This hour meter is universal to all gasoline engines, it has a wide range pf use, and there are two-stroke or four-stroke options for your choice. LCD display makes it look more executive and distinguished. Hour meter is displayed on the LCD screen and can only be used on gasoline engines, and when the engine is working, the hourglass icon of the meter will jump and time, and when the engine stops, the meter will stop timing. With an induction design, it uses screws or adhesive to fix the surface of the car body, then it can sense the signal and start timing. Item Name: Hour Meter Material: ABS, Silicone Waterproof Grade: Full Body Waterproof Design, Waterproof Grade IP68 Maximum Timing Range: 9999.9 Hours Maximum Speed Range: 10000 RPM Battery Type: CR2430 Battery Capacity: 270mAh (Included) Battery Life: About 2 Years Features: Durable, Accurate, Waterproof, Easy to Use, Easy Installation Size: 5.1cm x 3.5cm x 1.5cm/2.01" x 1.38" x 0.59" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Note that severe vibration or violent use may cause the watch to work abnormally. Please do not disassemble this product. Please avoid using it in water or underwater. Package Includes: 1 x Hour Meter 2 x Fixing Screws