資料來源：https://www.seeedstudio.com/ReSpeaker-4-Mic-Array-for-Raspberry-Pi-p-2941.html

Description
This product does not have audio output. If this is a requirement please consider the ReSpeaker 6-Mic Circular Array Kit For Raspberry Pi,  the  ReSpeaker 4-Mic Linear Array Kit for Raspberry Pi ,  or the  ReSpeaker Mic Array v2.0. 

ReSpeaker 4-Mic Array for Raspberry Pi is a quad-microphone expansion board for Raspberry Pi designed for AI and voice applications. This means that you can build a more powerful and flexible voice product that integrates Amazon Alexa Voice Service, Google Assistant, and so on.

Different from ReSpeaker 2-Mics Pi HAT, this board is developed based on AC108, a highly integrated quad-channel ADC with I2S/TDM output transition for high definition voice capture. Besides, this 4-Mics version provides a super cool LED ring, which contains 12 APA102 programmable LEDs. With that 4 microphones and the LED ring, Raspberry Pi would have ability to do VAD(Voice Activity Detection), estimate DOA(Direction of Arrival) and show the direction via LED ring, just like Amazon Echo or Google Home.

Note

Please note that the package does not contain Raspberry Pi.

Please note that there are no any audio output interfaces on ReSpeaker 4-Mic Array for Raspberry Pi. It is only for voice capture. And you could use the headphone jack on Raspberry Pi for audio output.

Here is a video from Parvinder Yadav, it teaches how to use ReSpeaker 4-Mic Array for Raspberry Pi  to make google assistant. We really appreciate Parvinder's contribution to the community and hope this video can be a good help for you.

Technical Details
Dimensions    65mm x 65mm x 9mm
Weight    G.W 38g    
Battery    Exclude
MIC    4 analog microphones
LED    12 APA102 programable RGB LEDs, connected to SPI interface
Raspberry Pi 40-Pin Headers    support Raspberry Pi Zero, Raspberry Pi 1 B+, Raspberry Pi 2 B and Raspberry Pi 3 B
AC108    highly integrated quad-channel ADC with I2S/TDM output transition
Software Algorithm    VAD(Voice Activity Detection), DOA(Direction of Arrival) and KWS(Keyword Search)
Grove    2 Grove Interfaces
Voice Capture Distance    3 meters radius voice capture
Part List
ReSpeaker 4-Mic Array for Raspberry Pi    1
Documents
ReSpeaker 4-Mic Array for Raspberry Pi v1.0.pdf
Seeed's forum
AC108_Datasheet_V1.1
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[Wiki]ReSpeaker 4-Mic Array for Raspberry Pi
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