Hour Meter: Includes tachometer, hour meter, service meter; helps you track the number of hours you have spent on your engine. Total hours can be reset; 0.1 hour accuracy. MAINTENANCE REMINDER: Programmable maintenance timer (SERVICE), countdown maintenance reminder time; When the maintenance time is reached, the maintenance warning icon will flash to remind you. TACHOMETER: Accurately records your RPM when the engine is running and helps adjust the engine speed when idling. can be programmed for different engine ignition modes. REPLACEABLE BATTERY: Replaceable internal CR2450 battery, data will be retained after battery replacement; When the engine is stopped, the player will automatically turn off after 2 minutes; Press the button to read the screen, the data will be retained after shutdown.