Wireless: wireless operating hour, vibration activated. Used to track engine running time for all types of engines activated by the vibration of the device. PARAMETER: The engine hour meter is equipped with an LCD display (5-digit display), displays the operating hours of the engine, which can record up to 9999.9 hours, the resolution is 0.1 hours. Easy to install: together with two side holes for attachment, no wiring required, or attachment with enclosed accessories. Automatic roll over, no power connection required (internal battery CR2032). Wide application: the vibration hour counter is often used for many mechanical devices such as generators, vibrators, lawnmowers, motorcycles, cars, trucks, etc.