Sennheiser made use of established technologies from the high-end headphone sector to ensure a clear stereo sound with excellent detail.

ENGADGET: Sennheiser launches the Momentum retro-cans and CX890i earbuds

BellSouth will use similar technologies, and it expects to pass half of their 12 million households by the end of 2007 and three-quarters by the end of 2009.

FORBES: Magazine Article