The VC-01-Kit_CN is a V-Audio Module ROHS manufactured by Ai-Thinker. It is an analog voice control device which can be used in a variety of applications, including voice command for home automation systems, voice monitoring, voice recognition for unmanned devices, and more. The module is equipped with a voice detection chip, a voice recognition chip, and a DSP (digital signal processor). It has a microphone input interface, audio output interface, I2C I/O interface, 4-channel LED indicator, and a reset pin. The module can detect human voice, recognize commands accurately, and output and store the result of recognition. The voice detection chip has a 37dB microphone preamplifier and a Voice Activity Detector (VAD) that can detect voices within a certain range. The voice recognition chip of this module has a 5KW vocabulary and can recognize up to 10 different commands per language. The DSP can filter the signal and extract audio features for better voice recognition accuracy. This module has low power consumption and supports multiple audio signal formats.