On the top is a mini slide potentiometer. The Slider Trinkey comes preassembled with the potentiometer already soldered onto the board. It is readable in CircuitPython as board.POTENTIOMETER and in Arduino as PIN_POTENTIOMETER.

On the bottom are the three potentiometer pins: POT on the top left, 3.3V on the bottom left, and ground on the right.

On the end of the board, opposite the USB connector is a capacitive touch pad. You can read this pad in CircuitPython at board.TOUCH and in Arduino at PIN_TOUCH.

At the end of the board, opposite the capacitive touch pad, is the USB connector. Plug the Slider Trinkey into any USB type A port or adapter with the potentiometer facing up to use the board.

On the bottom of the board, towards each end of the potentiometer, are two NeoPixel LEDs, mounted to shine through to the top of the board.

They are addressable in CircuitPython as board.NEOPIXEL and in Arduino as PIN_NEOPIXEL.

The center of the board is home to the SAMD21 microcontroller. This is the brain of the board.

The button on the back of the board is the Reset button.

Tap once to reset the board. Tap twice to enter the bootloader (needed for installing CircuitPython).

The circular pads on the back of the board are the debug pads. They are labeled from left to right: SWD (data), SWC (clock), and RST (reset).