Portable electric guitar

A portable electric guitar, comprising:

• a neck provided with a guitar strings on an upper side of the neck;
• a head machine is provided on one side of the neck;
• a piezo device is provided on the head machine for amplifying a sound;
• a first cover configured to have a “∩” cross-sectional shape and connected to one end of the neck by a first hinge and to have a first space capable of accommodating the neck therein when the first cover is in a opened state at a lower end and by rotationally opening or closing the neck to the outside about the first hinge;
• a second cover configured to have a “∩” cross-sectional shape and connected to one other end of the neck by a second hinge and to have a second space capable of accommodating the neck therein when the second cover is in a opened state at a lower end and rotationally open or close the neck to the outside by rotating about the second hinge;
• a speaker accommodated in the first space of the first cover;
• a detecting sensor configured to sense closing or opening of the first cover and output a signal to a controller according to the closing or the opening of the first cover;
• and
• the controller configured to receive the signal from the detecting sensor, to switch a mode of the speaker between a speaker mode and an amplifier mode, and to turn the piezo device on or off for playing the guitar.