Vintage Working Casio fx-11 scientific calculator with its case , It is a vintage scientific calculator from the late 1970s (around 1977-78). It features a green vacuum fluorescent display (VFD) capable of showing eight digits plus a two-digit exponent. The calculator runs on 4 AA batteries. ( not in the sale) It includes functions for trigonometry, logarithms, and powers. the item dimensions are all indicated on the photos, this is a great collectors item, thanks and good luck with this Auction.