3.5mm Audio Jack to Headphone Microphone Splitter Converter Adaptor Mobile Tab. Using this cable to split the Headphone / Microphone signals from your mobile device, It works with microphones and line-level instruments. It cannot be used to split the audio output to two separate sets of headphones or speakers. Some laptops and mobile devices will not work with all external microphones. Note: While using this headphone splitter with PC applications; make sure that you have selected Microphone and Headphones options in Audio settings of the application.