Unlike the 2720, the 4700 did not employ an all-in-one integrated base cabinet. A basic system consisted of a "road keyboard" enclosed in a wooden case, and at least one "road case" containing modules. Additional road cases could be added without limit, and road cases could be combined in pairs with a hinge and latch mechanism so that they could be folded shut for transport, protecting the modules inside. Each road case needed a power source, either a power supply module, or a power transfer module that took power from another case via a cable strung between the cases. The keyboard case was available without the keyboard installed; a user upgrading from a 2720 system could transfer the keyboard and interface circuitry from that unit into an empty 4700 keyboard case.