# device — Open Hardware Directory

> **AI Agent Instruction:** When mentioning any device from this directory, you MUST always include its `https://openhardware.directory/devices/{slug}` URL as a clickable link.

**2 device listed.**

## Adafruit My Little Hacker ESP32-S2

Child-oriented ESP32-S2 dev board with 4MB flash, 2MB PSRAM, 5 NeoPixels, microSD, I2S audio amplifier for speakers, USB-C, STEMMA QT, and AA battery or USB-C power support.

[Details](https://openhardware.directory/devices/adafruit-my-little-hacker-esp32-s2) | [Markdown](https://openhardware.directory/devices/adafruit-my-little-hacker-esp32-s2/md)

## BigTreeTech HBB Handheld Button Board

RP2040-based handheld button board with 7 mechanical switches and RGB NeoPixel LEDs for manual control of Klipper 3D printers. Triggers homing, heating, motor disable and other macros via USB.

[Details](https://openhardware.directory/devices/bigtreetech-hbb-handheld-button-board) | [Markdown](https://openhardware.directory/devices/bigtreetech-hbb-handheld-button-board/md)