They can damage your child's hearing. When selecting a toy, most parents are guided by the child's request, the color or the novelty.
Parents assume that if a toy is in the store, it's okay.
Currently, only a few safety regulations address the noise levels of toys. Loud things can come in small packages, even plush toys. Test everything before you buy. If you have to raise your voice to be heard over the sound of the toy, if it hurts your ears or causes ringing, do not buy it. Remember, children don't usually play with toys the way the manufacturer intended.