| 1. A Bluetooth earphone, comprising a left ear muff, a right ear muff, and an intermediate connecting unit, further comprising
a power supply unit, a Bluetooth receiving circuit, and small loudspeakers installed in the left ear muff and the right ear
muff respectively, said left ear muff and said right ear muff being electrically connected through conducting wires installed
in said intermediate connecting unit, characterized in: further comprising a speaker amplifying circuit, a switching circuit
which selectively outputs input signals from an input terminal to its first or second output terminal, and a speaker installed
in at least one said ear muff being connected with the output terminal of said speaker amplifying circuit; the output terminal
of said Bluetooth receiving circuit being connected with said input terminal of said switching circuit; said first output
terminal of said switching circuit being connected with said small loudspeakers and said second output terminal being connected
with the input terminal of said speaker amplifying circuit, the switch circuit selectively output the audio signals to the
small loudspeakers or the speaker amplifying circuit and the speaker amplifying circuit outputs amplified signals to the speaker
and wherein further comprising an earphone amplifying circuit which is connected between the output terminals of said switching
circuit and said small loudspeakers.
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