Earphone ergonomic curly cable 3.5mm, 4 pin
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     Diameter: 16 mm
     Output level: 92 dB / 0.05 Watt. 0.01 meter (Artificial Ear IEC-318)
     Input power: 0.1 W
     Maximum input power: 0.2 W
     Output impedance: 32 ohms
     Connector: 3.5mm, 4 pin
It is also suitable for some models of other brands such as
VERTEX: VX-132, VX-150, VX-160, VX-180, VX-210