an interface component for insertion in a certain - sized connection box placed for another component such as a switch or other electrical mechanism . the interface component may bring in new capabilities plus maintain the capabilities of the removed component . the box need not be removed , or if the boxed is removed the structure or space encompassing the box need not be enlarged . further , no new wiring is necessarily needed . this placement or substitution may be particularly applicable to rooms of hotels , motels , and other similar facilities . neither time nor expense of redoing structure to hold a larger box or provide more space or wiring is needed . in many cases , there is not adequate space to add components for providing additional capabilities to a room .