Found this MAC when scanning my LAN.

d4:4b:5e:██:██:██ Redacted for obvious reasons

The HW:ID belongs to Taiyo Yuden Co., Ltd.

I look up the company, and guess what?

They specialize in optical wireless communication.

Optics?

Comms?

Wireless?

-suddenly The Voice of Q pops into my head-

"⚔! You must tell the fellow anons about your fresh dank doughs! GO NAO!"

sauce

https://www.yuden.co.jp/ut/solutions/wireless/optical_wireless_communication/