According to one exemplary embodiment of the present disclosure, there may be provided a head mount device including a housing including a device mounting portion to mount an external electronic device on an upper side of the head mount device, a holder assembly rotatably installed at a periphery of the device mounting portion and comprising a protruding terminal, and at least two gendered connector assemblies each removably attachable to the holder assembly. The at least two gendered connector assemblies each comprising an exposure terminal adapted to be electrically connected to the protruding terminal and a locker to fix each gendered connector assembly to the holder assembly, the each gendered connector assembly has a connector corresponding to a different connection profile, and one gendered connector assembly among the at least two gendered connector assemblies is removably attached to the holder assembly based on the connector of the one gendered connector assembly corresponding to a connector port of the external electronic device mounted to the device mounting portion. Other various exemplary embodiments are also possible.