The larger file contains "photocopies" of the four pages of the EnterPhone brochure, including the "Enterphone-Quick-Reference" single page. You can print out a copy of any or all pages for your convenience. NOTE: You do not need telephone service to utilize the Enterphone system. There is at least one telephone outlet (and usually all outlets) that is connected "to the front door". Simply plug an ordinary telephone into such an outlet. You cannot place "outside calls", but your visitors, service people etc can call you.