Jill operated via two-track cassette tape. One track contained the audio, the other contained information for the doll's movements (just like teddy ruxpin, and similar to the earliest animatronics at disneyland which used audio signals on multitrack tape to control both sound and robotics). It needed four 'C' batteries and a 9-volt. This hideous, cassette walkman atrocity cost $100 retail, and additional tapes were for sale. I'm not so sure about the "I'm smart" claim. Considering the technology, I'm guessing it's bullshit.