Glensound GS-TRRS Stereo Single Mobile Phone Audio InterfaceThe GS MPI TRRS (Glensound Mobile Phone Interface Tip Ring Ring Sleeve) is a professional broadcast audio interface for connecting domestic mobile phones to broadcast equipment via the phone's analogue headphone microphone jack socket. It converts a line level output from your broadcast equipment to a microphone circuit for providing audio to your mobile phone, while simultaneously taking the headphone output of your mobile phone and converting it to