Puck.JS PCB design question, why a separate blue PCB from Raytao Corporation, what about it??

Hi!

All the pages that show photoes of the PuckJS, show that its hardware is made up of a grey PCB, that seemingly another blue PCB is mounted on, and on that blue PCB there's a metal cover writing "Raytao Corporation", and then separately an electronic component that writes "4 4" on it.

I have a question here:

So then, what PuckJS actually have done, is to source a NordicSemi nRF52832 module from Raytao Corporation?

For what reason, to delegate the consumer radio equipment certification process to Raytao Corporation?

Where can I read about Raytao Corporation?

What component is the "4 4" thing, a resistor?

Where is actually the antenna in the Puck JS, is it actually the metal cover that writes Raytao?

If a PuckJS is in clear sight, or under cotton textile, how many meters do you expect its Bluetooth signal to reach?

Thanks!