Kid-Friendly Speech and Occupational Therapy Materials

There are many items here. I am interested in the Echo microphone because my son tends to mumble a bit and it's a bit on the annoying side. It irritates him when I say words the way that he says them so I know that he understands how they should sound. If he hears himself enough, I hope that he corrects his speech on his own and with the microphone, he surely will have fun, InshaALLAH. Also, since they are so inexpensive, I had better get some for the others as well, lol.