This is a kickstarter project started by a M.I.T. post-doctoral physicist, a master degree biologist and a experienced mechanical engineer. Briefly, the IEMs have 1) mp3 player built in; 2) no wire required for listening; 3) storage space for up to 24 mp3s; 4) battery life of 3-4 hrs; 5) 6mm micro dynamic drivers; 6) controls operated by bite force. http://www.kickstarter.com/projects/701992503/the-worlds-only-earbuds-with-no-strings-attached/description http://www.kickstarter.com/projects/701992503/the-worlds-only-earbuds-with-no-strings-attached?ref=banner TECHNICAL SPECIFICATIONS Processor: ARM Cortex M3 32bit Memory: NOR Flash, capacity from 64MB to 256MB Max Audio Output Power per channel: 20mW Audio Amplifier SNR: 100dB Speaker Type: 6mm Neodymium Dynamic Driver Frequency response: 20Hz-20,000Hz Sensitivity (1kHz): 105dB/mW Speaker impedance 16 Ohm I am not sure I will back this project or buy their product yet. But the idea is pretty cool. Disclaimer: I do not know the designers of that project and have not communicated with them. I just saw it on Kickstarter and thought I would share this cool idea.