Universal serial bus chargers and charging management methods thereof are provided. The fragrance systems can inject a fragrance into an airstream that is supplied to a space such as a room of a building or a vehicle cabin. A rack on the track is engaged by a worm gear for adjusting the brake pedal location. An easily deflectable detent is provided on a lockset housing for releaseably locking the lockset assembly within the base frame of the cheek plate assembly. The overskirt is preferably reversible and includes at least one aperture through which a portion of the attachment mechanism is insertable. A method for efficiently, inexpensively and safely preparing prostaglandin derivatives, of which typical example is latanoprost, is provided.