I bought one for my first wife back in the 70's. Battery powered, I think C cell, plain white generic shaped. She used it while I was at work as I was away for a few days at a time. One day I came home to find her naked face down on the bed humping it. It was such a turn on I immediately stripped and replace the toy with me. Afterward I asked why she humped it she said the batteries were dead and she was still horny. I made a point of keeping her well stocked in C cell batteries.