[Item 1] - 3.5mm TRRS female to two TRS male, one plug for the mic jack and one for the audio jack, designed to connect combo-plug headsets to a dual-TRS-jack PC or laptop. (NOTICE: CTIA standard, the mic not compatible with OMTP standard, IOS, Bose, or Beats headphones). [Item 2] - This headset adapter is 3.5mm CTIA TRRS Male to Dual 3.5mm TRS Female, one female port for mic, and one for audio. It's compatible with ONE dual-plug gaming headset (with separate 3.5mm audio and microphone plugs, NOT 2 headphones), to connect to an audio+mic combo-jack device. Eg: Xbox one controller, Smartphone, Notebook, Laptop, Tablet, PC to gaming headset splitter. (Notice: NOT Compatible with Beats/Bose/IOS earphones, condenser microphones, TRRS mics.)