Features: 1. Cumulative total running time TOT. 2. Measures the current engine RPM. 3. The tachometer records the total running time and RPM of the gasoline engine by obtaining an 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 gas engine. Specifications: with high quality Color: Black, Orange, Green, Yellow, Red, Blue Size: 53.5 x 36.2 x 14.6 mm Display Screen: LCD TOT Range: 0-99999H RPM Range: 0-30600RPM 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.