An electrical connector assembly includes an inner connector defining a front-to-rear mating axis and mounting a plurality of conductive terminals. The shaft has a rotor at one end which is in a chamber in a housing supporting the shaft. A forearm massager configured to be capable of giving pressure stimulation to the forearm with the forearm of the user sandwiched between the fix and support portion and the pressing portion is provided with a fitting protrusion fitted in the fitting groove. The method also includes specifying logical connections for the plurality of associated data nodes.