2.5mm To 3.5mm Stereo Audio Jack Adapter (2 rings) For audio / muisc output ONLY, audio input not available: Mic on the cell phone headset will not work with this adapter. Perfect replacement for the original cable adapter Light Weight, compact, stylish, convenience Perfect for MP3s, games, CD-players and all other audio devices Perfect for road warriors, home, and office users NOTE: this adapter carries audio output only, not compatible with audio input.