For audio / muisc output ONLY, audio input not available: Mic on the cell phone headset will not work with this adapter. * 2.5 mm output allows you to use your existing Kyocera, LG, Motorola, and Sanyo headsets with any CD player, MP3 players, and other audio socket * Adapter allows connection to any 2.5 mm stereo headphone * Adapter also allows your cell phone headphone to connect to any CD or MP3 player. * Cable Length:4" / 10.16 cm...Output: 2.5 mm Stereo Socket