The most basic model in this lineup is the “Nano Every”, a 5V board with the ATmega4809 at its center. This brings 48 KB of flash and 6 KB of RAM to the party, running at 20 Mhz.

Arduino has announced four new Nano microcontroller-based boards that will be available for developers and makers in late July. ... (I/Os) and should not be used for connecting to 5V signals. ...