Need help identifying Timex Sinclair ZX81 "Programmer Console" on eBay

[Dan MacMillan]

Hi everyone,

I collect Timex Sinclair / ZX81 gear, but have never seen one of these before:

https://www.ebay.com/itm/RARE-Vtg-TIMEX-SINCLAIR-ZX81-Computer-PROGRAMMER-CONSOLE-Keyboard-Program-Micro-/222912636711?_trksid=p2047675.l2557&ssPageName=STRK%3AMEBIDX%3AIT&nma=true&si=E3Q5DniESsEnsW083EldQnt%252FNf4%253D&orig_cvip=true&rt=nc <https://www.ebay.com/itm/RARE-Vtg-TIMEX-SINCLAIR-ZX81-Computer-PROGRAMMER-CONSOLE-Keyboard-Program-Micro-/222912636711?_trksid=p2047675.l2557&ssPageName=STRK:MEBIDX:IT&nma=true&si=E3Q5DniESsEnsW083EldQnt%2FNf4%3D&orig_cvip=true&rt=nc>

Do any of you recognize it? Can you explain its purpose, please?

Cheers,
-Dan