Thanks for your help! I couldn't remember what specifications were needed, but I remember now about the lower magnification. I had planned to buy another one, but the store no longer stocks it, and I can't recall the brand. It had 20x/40x/400x magnification and was around $200. I figure a higher price means better quality... This particular one means I can also buy the telescope.

My son will be seven. I will probably get the projection screen.