I've seen the Retro Games Corp follow up video and a few others on the device but I can't recall all the info.

The firmware is largely where I'm in the dark. Does it have a proper sleep mode? Any news of custom firmware or updates?

It seems pretty neat and I feel like it would make for an alright pocket device to pair with my RG405M.

Also which colour do you think looks the best?

I was leaning towards the green or red but I saw the black and it looks pretty neat too. I'm wondering which looks good with the green LEDs on the side.