Functional box assembly, headphone, and headphone system

A headphone, comprising a functional box assembly, wherein the functional box assembly comprises:

• a box body having a control region configured for installing a button, the control region being provided with at least two button regions;
• and
• the button disposed in the control region, the button comprising at least two trigger portions corresponding to the at least two button regions, wherein the box body and the button are connected through a spacing portion, such that the at least two trigger portions and the at least two button regions are spaced apart from each other,
• wherein the spacing portion is located between two adjacent button regions of the at least two button regions, and the button is rotatable around the spacing portion to bring one of the at least two trigger portions into contact with a corresponding button region of the at least two button regions.

A headphone system, comprising a headphone and a charging case configured to charge the headphone, wherein the headphone comprises a functional box assembly, wherein the functional box assembly comprises:

• a box body having a control region configured for installing a button, the control region being provided with at least two button regions;
• and
• the button disposed in the control region, the button comprising at least two trigger portions corresponding to the at least two button regions, wherein the box body and the button are connected through a spacing portion, such that the at least two trigger portions and the at least two button regions are spaced apart from each other,
• wherein the spacing portion is located between two adjacent button regions of the at least two button regions, and the button is rotatable around the spacing portion to bring one of the at least two trigger portions into contact with a corresponding button region of the at least two button regions.