1. The tachometer is applied to all gasoline engines with spark plugs. 2. Inductive design, you only need to tie the cable a few times on the spark plug to work. 3. The timing range is: less than 99999hours; speed range: within 30000RPM. 4. Backlight Adjustment,LCD liquid crystal display. 5. DC low-voltage power supply, built-in battery CR2450,DC3.0V The mode can be selection,battery can be replace. clamping line sensing + hand-held sensingdesign, the sensing distance of 3-5cm sensing Signal Better. The tachometer line is about 1.0meters long, Tachometer Hour Meter For Motorcycle ATV Snowmobile Boat Gasoline Engine (Two-button backlight) (include clip and cable) Color: Black Material: ABS Package Contents: 1 * Motorcycle Tachometer Gauge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.