Neckmike started in 2004 by the inventor Bo Franzen has successfully been selling the latest product version the GSM Neckmike since 2007. The concept behind the product is simple but very efficient, use a neck band with dual "neck" microphones and two noise and shockwave blocking earplugs and you have handy small product to use with your mobile phone wherever you go. I met Bo and checked the product out at the Mobile Focus 2008 event in Stockholm last week. I have used similar design earplugs on shooting ranges and going hunting in USA so I know they work.
See the demo video by Bo and you will understand directly what it is and does for you.