Features: Used to track engine running time for all types of engines, activated by the vibration of device. It is wireless, vibration activated. With LCD digital display (5 digit display), show engine hours of operation. Automatic roll over, no power connection required (internal battery CR2032). Complete waterproof, easy to install. Specifications: Material: ABS Plastic Color: Black Size: 53.2x35.6mm Screen Size: 24x10mm Timing Range: 0-9999.9hours Resolution: 1 min/ 0.1 hours Fitment: for Motocross, Marine, Motorcycle, Snowmobil, ATV, Boat, Generators, Tractor, lawn mowe and any other vibration devices. Package Included: 1 x Digital Vibration Hour Meter 2 x screws