Dev Kit -1 -1U -1R -1RU

[nwgarner]

Hello,
I'm shopping for an S2 dev kit and I see models with -1, -1U, -1R, -1RU. I understand that -1 has a trace antenna, -1U has a u.Fl but I can't find any documentation as to what the 'R' designation denotes. Is it a chip antenna? Perhaps just a pad?

Thank you,
Nick

[WiFive]

R is for psRam

[nwgarner]

R is for psRam

Great, thank you.