Size:12.6×8.5×2.7cm 1.A logical reasoning IQ game 2.Enhance your IQ 3.Can set puzzles by yourself 4.Random puzzle selection function 5.10 helps 6.5 difficulty levels (each level has 999 puzzles for choice) 7.Can check the answer at any time 8.Automatic shut-down function 9.Automatically save the current game information after shut-down 10.Real time display (24 hours system) 11.Alarm 12.Batteries:2×AAA(not included) 13.LED backlight(9005L)