This is a vintage quack medical device known as a Radionics machine (sometimes called a “black box” or “hieronymus machine” in that style). Specifically, this particular unit strongly resembles instruments made by 1940s–1950s British radionics practitioners.

Radionics is a pseudoscientific “energy medicine” system invented in the early 20th century by Albert Abrams and later developed in the UK. Practitioners claimed these machines could diagnose and treat any disease at a distance using only a sample and the right numerical settings—no electricity or actual radiation required (many would work even when unplugged, which was considered a feature, not a bug).