Features: 1. Cumulative total running time TOT. 2. Measures engine RPM. 3. The tachometer records total running time and RPM of the gasoline engine by detecting induction from the spark plug cable at engine start. 4. When the engine starts, the LCD displays the current RPM; 5. When the engine stops, the LCD shows the total running time. Works on any gasoline engine. Specification: with high quality Color: Black, orange, green, yellow, red, blue Size: 53.5*36.2*14.6mm Display Screen: LCD TOT Range: 0-99999H RPM Range: 0-30600R Easy Installation - Peel and stick; no wiring necessary, or attach with included hardware. Internal Battery - Connects to spark plug wire Package includes: 1 x Hour Meter 1 x Cable 2 x Screws Note: Colors may vary slightly due to different monitor displays.