Here is another electronic chess computer capable of giving you a strong challenge. The Radio Shack Chess Champion 2150L was made in the 90s. It has 64 levels of play and auto-play mode. It has a LCD display with a 2nd tiny chessboard to show the moves.
This board can play at 2150 USCF level at its max level. You can power it by batteries or an adapter. More info is available here.