Shure i2cT Sound Isolating Earphones with Connector for Treo 650 Dynamic MicroDriver Technology plus VoicePort Mic and Multi-function Control Switch Direct single connection to Treo650 Switch back and forth between music and cell phone use for a seamless, high-quality listening experience VoicePort  inline microphone filters out background noise Shure makes audio equipment - microphones, earphones, mixers, etc. that are used by professional musicians the world over