The earlier version of the Eigenmike microphone – the em32 - was the first commercially available higher resolution spatial microphone. After over 10 years on the market it is now superseded by the em64.
Some technical highlights for the em64 Eigenmike microphone:
What is a spatial microphone?
A spatial microphone records the sound field surrounding the microphone rather than just the sound at a point in space. This enables the sound engineer to explore and edit the soundfield recording, adding many more degrees of freedom compared to traditional sound recording.