The calculator works great when tested with HP AC Adapter (NOT included). The item "VINTAGE HP-67 SCIENTIFIC CALCULATOR" is in sale since Thursday, December 24, 2020. This item is in the category "Business & Industrial\Office\Office Equipment\Calculators". The seller is "kobel-co" and is located in San Jose, California. This item can be shipped to United States, all countries in Europe, Canada, Australia.