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TRRS connectors are the 3.5mm 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 video signal (like in some MP3/MP4 players) If you’re hacking on something that has a 4-conductor audio jack, being able to plug straight in will keep your build clean and simple.
Length: 18" Long (45.72 cm)
Contents and images source: Sparkfun