I was very excited to get a non battery educational item for my grandson.  I guess in my memory of years ago this was a better product.  The concept is great, easy to use.  BUT you are suppose to press down and see the number.  It is so faint you can hardly see it!  I mean you couldn't have used a very dark black ink so it would show up?  I would rather it be battery operated and lit up!  I have to send it to him now as too late to return as I leave for out of town tomorrow.  Did I get a dud ?  Did everyone else's come with a dark number you can see easily?  As much as I like the concept I would definitely by pass this toy.  Which is a shame because they could have fixed so easily.