Rare, Operation Confirmed, Omron 840M Calculator, Showa Retro, Fluorescent Display Tube VFD With √, %, +/- keys This is an OMRON "ELECTRONIC CALCULATOR 840M" that lets you feel the breath of the Showa era. Its most distinctive feature is the beautiful and vivid blue-green color of the "fluorescent display tube (VFD)," which is not found in current LCDs. It's a vintage item that also stands out as an interior decoration, and it's maintained in usable condition. Product Condition Operation: Confirmed. All buttons respond, numerical display and calculation functions are good. Exterior: There are minor scuffs and signs of use due to age, but no major damage, and it is in relatively clean condition considering its age. We would like to pass it on to someone who can enjoy its vintage charm. Battery Compartment: Operates with 2 AA batteries. Product Specifications Brand: OMRON (Tateishi Electric) Model Number: 840M Display: 8-digit fluorescent display tube Power Source: 2 AA batteries (or AC adapter *sold separately*) This is a rare, old calculator made in Japan. Highly recommended for collectors and those who like retro gadgets.