portable mini metronome musical instrument accessories

after use: after moving the rudder to the center or bottom position of the pendulum, replace the protective cover. 5, note: ---the protective cover must be attached after use --- try to avoid using or storing in dusty and humid places ---if you need to use lubricating oil, you must choose advanced watch oil --- need to clean the metronome often --- do not use high volatile chemicals to clean the metronome