<p>➀ Arduino released the Nano R4 with headers, featuring a Renesas RA4M1 microcontroller (Arm Cortex-M4), designed for smart home and compact prototyping projects; </p><p>➁ The board offers 21 digital I/O pins, dual I2C ports, and pre-soldered headers for easy breadboarding, alongside compatibility with Arduino UNO R4; </p><p>➂ Priced at $13.30, it supports modular expansion via Qwiic/Stemma QT connectors and is already sold out due to high demand.</p>