Headphone with speaker function

A headphone with speaker function, comprising:

• a first playback unit having a first speaker for playing sound;
• a second playback unit having a second speaker for playing sound;
• a first audio source interface disposed on the first playback unit, and is electrically connected to the first speaker and the second speaker;
• and
• a second audio source interface disposed on the first playback unit or the second playback unit, and is electrically connected to the first speaker and the second speaker via an amplifier circuit;
• wherein when an audio signal is transmitted from an external audio interface via the first audio source interface, the headphone is operated under a headphone mode, and the audio signal is playback via the first speaker and the second speaker, when an audio signal is transmitted from the external audio interface via the second audio source interface, the headphone is operated under a speaker mode, and the audio signal is playback via the first speaker and the second speaker after the audio signal is amplified by the amplifier circuit;
• wherein the first playback unit and the second playback unit are connected to each other by a head band, a fork portion is disposed at each end of the head band for clamping the first playback unit and the second playback unit respectively, when the headphone is operated under the headphone mode, sound output surfaces of the first playback unit and the second playback unit are faced to an inner circumference of the head band, when the headphone is operated under the headphone mode, the second audio source interface is blocked behind by the fork portion.