The Comprehensive Premium 4-pole TRRS 3.5mm Mini Plug to XLR Jack and Stereo 3.5mm Mini Jack Audio Adapter is a nickel finish audio adapter cable with a molded connector. It allows connecting a standard microphone with XLR connectors to an iPhone or other compatible device for quality recording. It also provides a 3.5mm TRS stereo (audio out/headphone) jack for audio playback to standard headphones, speakers or audio input to other devices. It incorporates passive components which provide impedance matching and DC blocking; allowing a wide variety of microphones to be used with the device. This adapter is the perfect solution for interfacing a phone with a quality microphone for recording or production. This adapter is used for interfacing the iPhone with headphones and/or using a quality microphone for recording or production.