Aimilar Wireless Waterproof Vibration Activated Hour Meter Hourmeter for Gas Diesel Engine Motors Lawn Mower Vibration activated hour meter No power required- sealed waterproof lifetime battery Track the Service Life of all Non-Engine Applications - automatic vibration activated recording Easy installation-peel and stick,no wiring necessary,or attach with enclosed hardware. Used for gas diesel engine motors,such as lawn mower, tractor,truck,trailers,motors,equipment,machinery,etc.