http://www.lasvegasproaudio.com/sostmicandbe.html

Portable Surround Microphone from SoundField

SoundField’s unique technology is now available in a miniaturized package powered by A/C or batteries as the new portable ST350 microphone system.
The ST350 is comprised of a lightweight multi-capsule microphone and fully featured compact mic-pre/control unit that generates surround and stereo simultaneously at balanced line levels.
The ST350 has been designed from the ground up and is the result of a comprehensive R&D program incorporating feedback from recordists, broadcasters and SoundField users. The new microphone electronics are capable of driving long cable runs, enabling the microphone to be positioned hundreds of yards away from its control unit or alternatively handheld on a short boom.

Fuente: harmony_central