[Ladyada] and [pt] had an old keyboard from NeXT, but since it used a custom protocol it wasn’t usable with modern hardware. So they built a custom device to convert the NeXT protocol to USB.

up to 36 Month Battery Life B09T3H12GV Logitech MK240 Nano Wireless USB Keyboard and Mouse Set Wireless 12 Function Keys, 2.4GHz Wireless, Spill-Resistant Design B01N4EV2TL HP USB Wireless Spill ...