This item was received during the Starlight Express event. It works by turning the screw on the right side. Please consider it as junk since the duration and accuracy are unknown. It's an old item, so there may be minor scratches and stains. Please refrain from purchasing if you are sensitive to such imperfections. There is no box or instruction manual. Please understand that this is a used item. Thank you! #EndlessNight #endlessnight #KansaiTV #ktv #Starlightexpress #StarlightExpress #RollerSkates #MayoKawasaki