New design front button TTO is a digital tachometer and hour meter that works on all gasoline engines. The number of hours an engine has been running is critical to its maintenance schedule. Attach one to your motorcycle or ATV and be aware of upcoming service requirements. Tachometer from 0 - 19999 RPM. Non-resettable hour meter from 0 - 99999 hours. Easily mount it to any surface using either the bolt-on (screw caps included, screws NOT included) or peel-and-stick mounting options. Max RPM features. Customizable warnings and maintenance reminders from 1 - 999 hours with flash alert service alarms. Detailed Specifications: Accumulated run time range ("HRS" on display): 0 - 99999 hours. Engine speed ("RPM" on display): 0 - 19999 RPM. Maintenance reminder ("Wrench icon" with HRS on display): 0 - 999 hours. Internal battery: Yes.