The item is a portable and practical LCD display tach hour meter tachometer, which is applied to all the gasoline engines with the plug, such as motorcycles, motor boats, ATVs, lawn mowers, boat, etc. With inductive design, you just need to tie the cable to the plugs and then the item can work. Features - Works on all ignition engines by selecting engine type using and S2 buttons. - One is to be wrapped around a plug wire and the other is a ground wire. - Wide operating temperature 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 plugs. - Powered by 1 x CR2450 battery(NOT included). Specifications - Material: ABS - Color: Black - Voltage: 3V. - Resolution: 0.1HRS / 10RPMs - Reading: 9999.9Hrs / 99999RPMs - Accuracy: 1 minute or 10 , Quartz - Operating temperature: Standard -30C-85C - Power supply: 1 * CR2450 battery(NOT included) - Product Size: 5 * 4.5 * 2cm. Package list: 2 * 3V LCD Display Plugs Tach Hour Meter (Black)