A new MP3 player is now available called the MP3 Micro Sport. It seems to have no controls except for just 1 button and due to the small size of the device, it sits in your ear like a small bluetooth headset.
We are not entirely sure how the single button operation works. Maybe it uses a sequence of button presses to start, skip and control volume etc…
Included with the MP3 Micro Sport player is another headphone that you attach to the main unit and wrap the cable around the back of your neck to provide both ears with sound.
A couple of versions are available with the 2GB model costing $55 and the 4GB model costing $77. Available from GeekStuff4u.