• GPIO #18, GPIO#19, GPIO #20, GPIO #21 - I2S Digital Audio.
• Speakers - The two speaker connectors are located on the bottom in the middle, labeled Right and Left. Plug in an enclosed speaker or  use a JST 2PH cable to attach custom speakers.
• Microphones - The two mics are in the middle of each side, labeled L Mic and R Mic.
• Headphones/Line Out - 3.5mm headphone jack located on the bottom right. Use any headphones or Line-Out to another audio system.
• On/Off Switch - Located towards the left in the middle of the board, switches audio on and off.

This pin has a 10K pullup to 3.3V so when the button is pressed, you will read a LOW voltage on this pin.

• GPIO#17 - Button

• SCL, SDA - I2C data for the STEMMA QT / Qwiic connector. Can also use with Grove sensors with an adapter cable. Great for quickly adding sensors or accessories with plug-and-play.

Three fully color RGB addressable LEDs can provide feedback or a light show. Uses DotStar protocol (not NeoPixel) so any microcomputer can easily control the lights.

• GPIO #5 - DotStar LED data pin.
• GPIO #6 - Dotstar LED clock pin.

GPIO#12 - 3-pin JST digital or analog connector. Easily connect things like NeoPixels or servos using this 2mm connector. You can also use a generic JST cable to connect to a breadboard.