Features: 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). 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/Zero Attachment type: expansion board MIC: 2 analog microphones LED: 3 ap102 RGB LEDs Software algorithms: VAD (voice activity detection), DOA (direction of arrival) and KWS (keyword search) User key: 1 programmable key Speech acquisition distance: 3 m radius speech acquisition Size: 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. Package includes: 1PC x Raspberry Pi Respeaker