It was a toy that came in two parts. One was a backpack that could be strapped to Steve's back. The other was a microphone connected to the backpack by a wire. When the user spoke into the microphone, a speaker concealed in the backpack would amplify the user's voice. Thus, users could somewhat simulate the effect of talking to Steve remotely.
The packaging on the product was somewhat misleading in that it claimed the device could "transmit" the user's voice to the backpack, and said there was "no limit to the exciting adeventures you can create" with the device. The "limit", however, was the length of the wire that connected the two parts of the toy. Though it did say that there was a "10 foot cord included", the packaging seemed to imply wireless communication, as with a walkie-talkie.