Dual audio earphone

A dual audio earphone comprising:

• a hollow enclosure and a speaker unit;
• the enclosure including a first chamber defined therein, the speaker unit being housed in the first chamber of the enclosure, and between a sound output end of the speaker unit and the enclosure being defined a cavity, the enclosure also including a sound hole communicating with the cavity;
• the speaker unit including a holder, a dynamic speaker, a piezoelectric speaker, and a circuit unit;
• wherein the holder has a bottom and a peripheral fence surrounding the bottom so as to form a second chamber in the holder, and the holder also has an opening facing the cavity, the piezoelectric speaker is housed in and flushes with the opening of the holder, and between the piezoelectric speaker and the sound hole of the enclosure is defined the cavity, the dynamic speaker is accommodated in the second chamber and is located between the piezoelectric speaker and the bottom of the holder, the dynamic speaker and the piezoelectric speaker send sounds to the sound hole of the enclosure, and the circuit unit is arranged outside the bottom of the holder and is electrically connected with the dynamic speaker and the piezoelectric speaker.