Here is another gorgeous chess computer from the 1980s that gives you a challenging game. The MEPHISTO MM II Modular Chess Computer has an estimated rating of 1960 ELO. It has a 3.7 Mhz processor and 10 playing levels. It is powered by a 8V adapter.
This chess computer has a user-friendly control panel that you can close when you are done playing. The above video shows it in action.