Portable electronic device

A portable electronic device comprising:

• a main body;
• a transmission line having a cable and a connector part, one end of the cable being electrically connected to the main body, the other end of the cable extending out from the main body and being connected to the connector part;
• and
• a compartment defining a receiving space and a restricting member with a holding portion therein, the compartment being pivotally connected to one end of the main body and having a closed position and an open position relative to the end of the main body, wherein the connector part and the cable are received in the receiving space and concealed by the compartment, and the connector part is held by the holding portion when the compartment is in the closed position, and the connector part is detachably connected to an external device with the cable being pulled out from the receiving space of the compartment when the compartment is in the open position;
• wherein the compartment comprises a bottom wall, two elongated side walls on opposite sides of the compartment and two shortened side walls between the elongated side walls correspondingly, and the four side walls perpendicularly extend upwards from four edges of the bottom wall and cooperatively define the receiving space;
• the compartment further defines a winding mechanism therein for winding the cable;
• the winding mechanism comprises a spool extended perpendicularly from one of the two elongated side walls towards the other of the two elongated side walls, and a gap is defined between a free end of the spool and the other of the two elongated side walls;
• and the restricting member is secured between the two elongated side walls.