This was one of my son's Christmas presents. It wouldn't work when we opened it, but would repeat our words in a garbled tone. I thought it was the batteries, so we went out and purchased three more. The new batteries didn't fix it. Since I didn't think it was worth sending back, I opened it up and discovered that the wires going from the battery to the circuit board were damaged. I soldered new wires on, and it works now.It does change your voice, but isn't a great toy. He, nor his two brothers, used it very much. I tried playing around with it to get them interested in it, but to no avail. It does work, however, after replacing the defective wires.