Features:brand new and high qualityThe reSpeaker 2-Mics Pi HAT has been equipped with 2 analogue microphones and WM8960 Audio Codec, for high-definition voice capture and process, designed to be the voice user interface for Raspberry Pi Series. Attach with NLU software algorithms, it has the abilities of Voice Activity Detection, Direction of Arrival and Key Word Spotting, widely used in Voice Interaction applications. It is a fine solution for local Neutral Language Understanding. Voice User Interface for Raspberry Pi Series:Placed by 4 analogue microphones, which come with the Voice Interaction algorithms of VAD(Voice Activity Detection), DOA(Direction of Arrival), KWS(Key Word Spotting).WM8960 Audio Codec:Low power, high-quality stereo Codec designed for portable digital audio applications.Controllable Peripherals:Provide 3 programable APA102 RGB LEDs and 1 User Button for attached Speech Recognition usage.Easy Assembly:Simply pop up on the Raspberry Pi to use. Specifications:Applicable model: for raspberry pie 4B/3B+/3B/ZeroAttachment type: expansion boardMIC: 2 analog microphonesLED: 3 ap102 RGB LEDsWM8960 codec: low-power, high-quality stereo codec, designed for portable digital audio applicationsSoftware algorithms: VAD (voice activity detection), DOA (direction of arrival) and KWS (keyword search)User key: 1 programmable keySpeech acquisition distance: 3 m radius speech acquisitionSize: 65mmx30mm Note:Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes:1PC x Raspberry Pi Respeaker