The advantage of the module is that it can be manufactured separately and grafted onto different movements. It is simpler than the basic movement, which makes production relatively economical. The module adds functional features to the movement, such as additional time zone, calendar, power storage, and moon phase profit and loss display. Modules are indispensable when it comes to unique displays such as roaming hours or retrograde. The disadvantage of the module is that it is superimposed on the basic movement and any raised parts must be laid out at different levels. To give a typical example, in the timing module (such as Audemars Piguet or Girard-Perregaux), the button and the crown are not in the same plane. Worse, the date module (usually part of the base movement) looks like it is at the bottom of the well.
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