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1. You can select whether it is on the left channel or the right channel by connecting the select pin to power or ground. If you need stereo, please pick up two microphones. 2. In addition to the analog output, there are three digital pins: clock, data and left and right clock (word selection). You can set them to stereo by sharing the clock, WS and data cable. 3. The bottom of this I2S MEMS microphone is a port, so make sure that the bottom hole is facing the sound you want to read. It is only a 1.6-3.6V device.