www.ChessComputers.org

Model: Fidelity Chess Card 6115
Manufacturer: Fidelity Electronics
Year: 1986
Est. ELO rating: n/a
Levels of play: 64
Type: Calculator / LCD

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Fidelity Chess Card. Model 6115.
World's Smallest Chess Computer? That's what it says on the package and I haven't really seen any dedicated chess computer that's smaller than this one. If you have found one, please let me know. The chess program is not really strong but this is an interesting unity regardless. You can fit the card and the board with the magnetic pieces in your pocket. Interesting concept.

It has some nice features such as: set up positions, warning about threats, allows player to change sides and you can get up to 65 hours of play with a battery (3-volt, lithium, type 2032)
I also have another similar mode, which is a clone, by Sphinx.

Fidelity vs Sphinx: