A Monopoly branded electronic calculator for the board game, released by Winning Moves under license from Hasbro. The calculator features buttons for each property on the Monopoly board, and comes pre-programmed with property values, mortgage rates, etc.
From the packaging:
"Monopoly Calculator provides instant investment analysis! Color coded buttons show the various properties, railroads, etc. Press one or two keys for any Monopoly value. (Rents, Mortgages, House Sales, Doubled Rent). Speeds up gameplay! Analyze the properties and know the odds! Also a real four-function calculator."