Hello, there are many styles and brands of audio wall charts. Generally speaking, a good quality audio wall chart has good sound, color, style and packaging. The circuit board is imported, with low resistance and long service life. Others are golden dolls, giant salamanders, little dragons, little dragons, little pandas, and so on. However, the quality is really not so good. Some are too hard, some are made of rotten paper, some are made of clinker, some are made of paper, which is easily broken, and some are circuit boards. Some resistors are too high, so batteries are put in. Today, there is no electricity, which is very troublesome. I suggest you take a look at the good baby.