Spectra SD-10 Sudoku Handheld Electronic Number Game - Thousands of Puzzles in the Palm of Your Hand! Spectra SD-10 Touchscreen Sudoku Number Game General Features: Touchscreen display with stylus Handheld size Thousands of computer-generated puzzles Three skill levels Sudoku Puzzle Builder and Solver Operates on Two (2) G13 batteries (included) Unit Dimensions: 4 x 3 x 0.75-inches (H x W x D, approximate) Regulatory Approvals: CE