eRIC Nitro features an ATmega328 AVR microcontroller with Arduino bootloader and a low-power eRIC radio module operating in the ISM band (433 MHz with eRIC4, 868 or 915 MHz with eRIC9). The MCU and radio module can work together or independently, giving you two powerful microcontrollers on a 2.5x5 cm board. The original board is part of an Internet connected weather station by Alex Robertson. It was the winning project of the LPRS contest.
The open hardware eRIC Nitro board now finalized by Elektor is published in the January & February 2016 edition of Elektor Magazine, the article may be found here.