My daughter has only had this toy for a few weeks, but she learned so quickly that she learned half of the third grade lesson plan in one day! That's great! The reviewer complained that you can't change the contrast, but you can. Just read the user manual. Another reviewer complained that it doesn't show you the correct answer if you make an error, but it does. Just before moving on to the next task, it displays the correct answer for about two seconds. The problem then returns at the end of the game. There is no way to adjust the volume. But there is a mute and silent attitude. It doesn't matter if the sound is on or not, it only bothers others if they leave it on. Now I will explain the durability. My daughter dropped it several times and it still works perfectly. As for the buttons, they work well. To make sure the keys work, each time you enter a number, verify that it is displayed before moving on to the next number. Which leads me to say that even if a young child knows the answers, they can't use it unless they're frustrated at having to check the numbers. You should also be aware that it is a full feature. Calculator, but that's not entirely true. It has no memory. The last problem is that unlike noise, there is no way to turn off the light. This is disappointing as the lights are very bright and staring at them for long periods can damage your eyes. If you need more information, after buying Math Shark, please read the user manual. I hope I've helped you decide what to fill your basket with.
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