1、Long Life: Built in button battery CR2050 power supply, low power consumption design, the battery life is about 5 years when working 8 hours a day. Automatically store data, will not be lost for more than 20 years. 2、Inductive Design: Just wrap one end of the induction wire around the spark plug 5 times, after continuously detecting the ignition signal of the spark plug, the real time engine speed will be displayed and the timing will start. 3、Application: Widely used in garden machinery such as hand push lawn mowers, riding lawn mowers, chainsaws, etc.; marine industries such as jet skis and outboard motors; vehicle industries such as motorcycles, off road vehicles, ATVs, and snowmobiles, etc. 4、IP68 Waterproof: The premium quality engine hour counter is completely sealed and has a waterproof rating of IP68. It can be used normally in harsh environments such as heavy rain, highly dependable. 5、Multiple Function: Timing function, speed function and sleep function. LCD digital display, easy to read, concentrate on driving to ensure safety. Professional design to solve more of your problems.