Installation method: use doule side taps,peel and apply to the back of the meter and mount.for more permanent application use drill template to locate mounting holes.DO not drill into tanks or engine crankcase. Mounting will determine sensitivity of the meter,In most applications the appropriate mounting sensitivity can be easily achieved. to make it more balancely to get more sensitivity. Features: 1.Replacable battery,battery type: CR2032. 2.Time display mode is optional.it is divided into hour system and minute system.For example,hour system 123.4,it means 123.4 hours equals 123 hours 24 minutes;And 123:06,it means123 hours and 6 minutes equals 123.1 hours.Short press button to switch the display mode. 3.In order to avoid the machine being transported in the way of and invalid vibration, or other invalid timing,you can shut down hour meter by pressing button 3 seconds,until display off .and start timing by pressing button until display show on . 4.Auto sleep,if there is no iginition signal, and no pressing button.it will auto sleep in 5 minutes to save the battery.when a ignition signal is received,it will wake up automatically. 5.If you want to reset,please remove the battery and wait for 5 minutes before putting it in.When the battery is running out of power,and you want to save the current data.Please try to put a new battery in within 2 minutes after you remove it. Application: Wireless hour meter record actual running time of traliers,motors,equipment and machinery or any vibrating equipmet which use on any application requiring tracking quarterly,anuanl,preventative maintenance. Features: Brand new and high quality. Track the service life of vehicle-oil changs, valve, adjustments, spark plugs, etc. Easy to install. Peel and stick,connect to spark plug wire easily. Battery replacabable, battery type:CR2032. Works on Any Gas Engine. Record and display to 9,999.9 hours. Hour glass symbol appears and flashes on/off to indicate counting time. Automatic roll over. Resolution: 0.1 hour. 100% epoxy encapsulated casing resists water, shock, stand fire of 85C. Specification: Color: Black Item size: 54*35*14mm Package size: 176*101*15mm Net weight: 42g Package weight: 71g Packing content: 1 x Hour meter 2 x Screw