Characteristics: tachometer/hourmeter with LCD display. Ideal for engines operating in the 25,000+ RPM range. Compatible with 2-stroke and 4-stroke engines. Features a reset-to-zero function; the hour meter reads up to 10,000 hours then resets to zero, and the tachometer can read up to 99,999 RPM. Programmable maintenance hour setting with service reminder for oil changes or other maintenance tasks. Includes black wire that wraps around the plug wire, compatible with all ignition engines by selecting engine type using S1 and S2 buttons. Splash-proof design and easy to install. Suitable for motorcycle, ATV, snowmobile, boat, outboard, quad, jetski, motorcycle, and dirt bike engines. Hour meter is resettable to zero; after reset, all stored data will be erased. To reset: Press and hold the S1 button until "05" appears. Release S1 and wait 810 seconds until display returns to time mode. Then press S1 and S2 simultaneously to reset system. Data from 0109 will be cleared. Default speed mode is 02. Note: Battery is replaceable. Not fully waterproof. Material: ABS Color: Black Package Contents: 1 x Tachometer Note: Light reflection and differences in display screens may cause slight variations in color appearance. Measurement error allowed is +/- 13 cm.