[Useage & Maintenance]: Keep track of actual running time and single working hours of the gas engine, adjustable maintenance interval time with reminder for oil change or other maintenance task; hours range: 0-99,999 hours, maintenance timer range: 0-2000 hours. [Idle Speed Adjustment]: Display the engine real-time RPM and highest RPM since engine started to adjust the idle speed, multiple cylinder configurations to be chosen for RPM value correction, extra alert channel for speed exceed reminder; RPM measurement range: 0-20000RPM, Alert value range:1000-20000RPM. [Backlights]: Green backlight will help to use it at night or the dim place, you can set the backlight for always-on, OFF and automatical mode as request; Red backlight will display to remind the RPM exceed warning. [Battery Saving]: Battery capacity will be kept in good condition with insulation sheet before using or during transport; Replaceable battery compartment and LCD shutdown also can extend the lifetime in vacant tim