Four-position audio cables, connectors, and adapters come in two different wiring standards: CTIA and OMTP. The four-position standard is more commonly referred to as Tip Ring Ring Sleeve (TRRS).
All StarTech.com TRRS audio cables, connectors, and adapters conform to the CTIA standard. Some OMTP audio devices can detect which pinout is being used and switch to the CTIA standard, but not all audio devices can do this.
The CTIA pinout is as follows:
TipLeft Audio Ring 1Right Audio Ring 2Ground SleeveMicrophone