3.5MM Audio Socket module

3.5mm Audio Socket Stereo Sound Module w/ Mic for MP3 Player – Red
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.