Abstract: A flexible arm that is configured to be located between and physically and electrically connect an acoustic module of an open-ear headphone to a battery housing of the open-ear headphone. The flexible arm includes a flexible printed circuit that extends through the entire original resting length of the flexible arm and comprises a conductor that is configured to carry electrical energy between the acoustic module and the battery housing. A first interface structure is coupled to one of the acoustic module and the battery housing. At least one link member is pivotably coupled to the first interface structure. A flexible material encases at least some of the flexible printed circuit, at least some of the at least one link member, and at least some of the first interface structure.