I have no idea, but that would be great.
I took some photos of the PCB and the little controller board on it - which is pretty much the only thing on there besides the sockets, an on-off switch, and a few other individual components.
An overview - sparse, but efficient.
This side is all flat and says “CIY Tester68”
Here’s the switch and a few other things on the other side - and it does say “GK68-BT606-V1.1” there behind them.
Here’s the controller - which also seems to be just about everything else. I’m guessing that squared-squiggle shape is an on-board antenna.
On the board is screened “BYKC-KBMD-HS6620-V1.0” with the date code “2021 04 02 LSH” - I think it actually says “ANT1” under the antenna thing - on the other side it says “U1 | HS6620”
On the main chip is written again, “HS6620”, and also “122XSDM | K510204”
The wee metal bit (crystal maybe?) says “M24.00 | CS 4L”
Another angle that highlights the squiggle bit.
The sockets are also branded CIY+ (they also have either HM or WH on the other side), and it looks like there are alternate positions for some to accommodate other layouts.
There also looks to be a place ready for an SMD LED for the caps lock - might have to practice on that.
