@RoyBoy Thanks for that info Roy. I went through my pile of ERR pouches, and found a Beep 2.0 and NW2 commander kit. They are quite a small footprint.
They were included in a lot of ERR items I recently bought and I didn't pay attention to them, no beep or NW or similar switchers.
It is interesting to learn about the early offerings, and I really like the RS4, by having the ability to put any RS4 board on it, it is very universal.