3.5mm Jack Stereo Headset Audio Breakout Board Connector Expansion Module.
Features:
1. TRRS connectors are audio style connectors that you see on some phones, mp3 players and development boards.
2. TRRS stands for "advice, ring, ring, sleeve", which reflects the fact that, unlike the standard stereo connector, there are actually three conductors and ground.
3. Some devices use an additional conductor for the microphone (like wireless headsets) or carry a video signal (as in some MP3 / MP4 players).
4. Mini design, portable and easy to use
5. Size: approximately 1.7 * 1.2 cm / 0.6 * 0.5 inch