CJMCU-TRRS 3.5mm Audio MP3 Stereo Headphones

Model:CJMCU-TRRS
Name: Audio breakout board
1.TRRS connectors are the audio-style connectors that you see on some phones, MP3 players and development boards.
2.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.
3.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).
4.Mini design, portable and easy to use
5.Size: Approx. 1.7*1.2cm / 0.6*0.5 inch
6.Material: Plastic + metal