Buy 01Studio Microphone Array 6+1Mic Array Sound Source Localization Beamforming Speech Recognition K210 Development Demo Board Maix          US $ Original Price : US $15.24 ()     Best Offer 01Studio Microphone Array 6+1Mic Array Sound Source Localization Beamforming Speech Recognition K210 Development Demo Board Maix with Free Shipping Worldwide!   Customer Review  4.  …