# 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.

**4 device listed.**

## AVR-HF ADX-MI3

Pre-built digital mode QRP transceiver for amateur radio, supporting FT8, FT4, JS8, and WSPR on HF bands from 160m to 6m with ~5W output, OLED display, and single USB-C cable operation.

[Details](https://openhardware.directory/devices/avr-hf-adx-mi3) | [Markdown](https://openhardware.directory/devices/avr-hf-adx-mi3/md)

## DFRobot Beetle CM-32U4

Ultra-compact Arduino Leonardo-compatible microcontroller board with ATmega32U4, integrated lithium battery charging, and native USB in a tiny 22x20.5mm form factor.

[Details](https://openhardware.directory/devices/dfrobot-beetle-cm-32u4) | [Markdown](https://openhardware.directory/devices/dfrobot-beetle-cm-32u4/md)

## DFRobot Beetle BLE

Ultra-compact Arduino Uno-compatible board with BLE 4.0 (CC2540), ATmega328P, sewable gold-plated I/O pads, and wireless programming in a 28.8x33.1mm wearable form factor.

[Details](https://openhardware.directory/devices/dfrobot-beetle-ble) | [Markdown](https://openhardware.directory/devices/dfrobot-beetle-ble/md)

## DFRobot Beetle Board

The original coin-sized Arduino Leonardo-compatible board with ATmega32U4, native USB, 10 digital and 5 analog pins, and sewable gold-plated pads in a 20x22mm form factor.

[Details](https://openhardware.directory/devices/dfrobot-beetle-board) | [Markdown](https://openhardware.directory/devices/dfrobot-beetle-board/md)