The item is a portable and practical LCD display tach hour meter tachometer, which is applied to all the gasoline engines with the spark plug, such as motorcycles, motor boats, ATVs, lawn mowers, boat, etc. With inductive design, you just need to tie the cable to the spark plugs and then the item can work. Features - Works on ignition engines by selecting engine type using and S2 buttons. - One is to be wrapped around a spark plug wire and the other is a ground wire. - Wide operating range. - Show engine and record hours of operation. - Large LCD display for easy reading. - Inductive design: You just need to tie the cable to the spark plugs. - Warm Tip: Dear buyer, due to lighting effect, monitor’s brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Specifications - Material: ABS - ColorBlack - Size: 7.35x4.7x2cm - Voltage: 3V. - Resolution: 0.1HRS / 10RPMs - Reading: 9999.9Hrs / 99999RPMs - Accuracy: 1 minute or 10 , Quartz Package list: 1 x Digital tachometer