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3.5MM Audio Headphone Female Jack 4 Pin Dip Soldron Auto Feeder Gun 15-30W 230V Purchase the 100K Rotary potentiometer3. 5MM Audio Headphone Female Jack 4 Pin Dip This is a Audio Jack 3. 5mm TRRS (SMD) 4Pcs. TRRS connectors are the audio style connectors that you see on some phones, MP3 players and development boards. TRRS stands for tip, ring, ring, sleeve, which reflects the fact that, unlike a standard stereo connector. This actually has three conductors and a ground. Some devices use the extra conductor for a microphone (like hands free headsets); or to carry a