These are the TRRS jack breakout board pins.

• Sleeve - This is the microphone pin (the sleeve or S in TRRS).
• Right - This is the right audio pin (the first ring or R in TRRS).
• RSw - This is the right switch pin. When the plug is not inserted, this pin is connected to the right contact. When the plug is inserted, this pin will float.
• LSw - This is the left switch pin. When the plug is not inserted, this pin is connected to the left contact. When the plug is inserted, this pin will float.
• Left - This is the left audio pin (the tip or T in TRRS).
• Ring - This is the ground ring pin (the second ring or R in TRRS).