Description: This digital Tach/Hour Meter will keep track of engine RPMs and running time for all types of gasoline powered engines. Powered by an internal lithium battery so no external power connections are required. You will wrap the RPM wire around the spark plug. The Tach/Hour Meter is activated by the spark of the engine. Features: Show both engine RPM and hours of operation. LCD screen display showing data clearly. Reads up to 60,000 RPM. Includes internal battery, no power connection required. Easy installation, suitable for 2/4 Stroke Engines, RC Toys, PWC, ATV, Motorcycles, Marine Engines, Chain Saws, Tractors, Lawnmowers, and gas powered tools. Specifications: Material: Plastic Color: Black Display: LCD Digital Power Supply: Internal Battery(CR2430) Waterproof Grade: IP68 Package Weight: approx. 85g Fitment: for 2/4 Stroke Engines, RC Toys, PWC, ATV, Motorcycles, Marine Engines, Chain Saws, Tractors, Lawnmowers, and gas powered tools. Package Included: 1 x Tach/Hour Meter with Wire 2 x Zip Cable Tie Note: It is easy to install, but professional installation is highly recommended.