Here is another compact chess computer that you can take with you anywhere to give you a good game. It has a 4Mhz processor and 2kb RAM. It has an estimated rating of 2000 USCF. You can interact with it with a stylus or your fingers.
This chess computer has various levels for you to choose from. It may not be strong enough for a FM or international master but it can give most players a good game.