KOSMOS Hand-Held Calculator/Biorhythm Computer

Nostalgia/Vintage Electronics. Collectors item, maybe? The Kosmos Biorhythm Calculator, popular in the 1970s, is a handheld device that not only does standard mathematical calculations up to 8 digits via a green LED display, but also calculates a person's physical (23-day), emotional (28-day), and intellectual (33-day) cycles based on their birth date, helping users track "good" and "bad" days, often featuring compatibility checks with other people's rhythms, though modern apps and software now offer similar, often more detailed, biorhythm analysis. Three new Duracell batteries installed. In original factory box with AC adapter, tan slip-over soft fabric case, owners manual and two informative Biorythm manuals.