Vintage FIDELITY ELECTRONICS Challenger Sensory Chess. As shown in the photos, we don't know how to play but it powers up when batteries are installed. Operates off 4 C batteries. Missing one of the moving pieces, only includes 31 pieces. " Batteries or AC adapter are not included ". Box is included but is in bad shape, has major damage and has been taped up. Inclides only what you see in photos.