Tri-functional dual earphone device

A tri-functional dual earphone device comprising an earphone device and a hand free receiver;

• the hand free receiver having a circuit;
• the circuit of the hand free receiver comprising:
• a left and right channel volume control unit for controlling the volumes of the earphone device;
• an EMI electromagnetic-proof filtering network being an LC lump circuit for preventing from EMI interference;
• a function module selection control unit having functions based on a <10 mainframe connected;
• a sound collector voltage protecting circuit for protecting a microphone;
• a speaker device for emitting sound;
• a microphone sound collector for receiving sound;
• an I/O (input/output) adapter for being connected with an outside device;
• wherein the I/O adapter is connected to the left and right channel volume control unit, the EMI electromagnetic-proof filtering network is connected to the I/O adapter, the function module selection control unit is connected to the EMI electromagnetic-proof filtering network, the sound collector voltage protecting circuit is connected to the function module selection control unit, the microphone sound collector is connected to the sound collector voltage protecting circuit, and the left and right channel volume control unit is connected to the speaker device.