Used to track engine running time for all types of engines, activated by the vibration of the device Wireless, vibration-activated design Features an LCD digital display with a 5-digit screen to show engine operating hours Automatic rollover function; no external power connection required (powered by internal CR2032 battery) Complete unit, easy to install Specifications: Material: Plastic Color: Black Timing Range: 099999.9 hours Resolution: 0.1 hours Package Weight: 55g Compatible with motocross, marine, motorcycle, snowmobile, ATV, boat, generator, tractor, lawn mower, and other vibrating equipment Package Included: 1 x Digital Vibration Hour Meter Note: The new or old version of this product may be shipped at random. Please ensure you are comfortable with this before placing your order.