Your POCKET CHESS computer is an ideal opponent. It is ready to play you at any time, as often as you like, at whatever level of skill you choose, it’s small size makes it especially suitable for use on a journey in conjunction with a travelling chess set.
Excerpt taken from the “Fidelity Micro Chess Challenger” User Manual
Two versions were made by Fidelity. This version has 12 Buttons, the other version has 16 Buttons. The software and play strength seems to be the same in both versions.