This is a Tandy Z-PDA Zoomer Personal Digital Assistant in the original box with the manual. Tandy had Casio manufacture this PDA, and Palm supplied the operating system. They only sold 20,000 Zoomers and I doubt there are many now with the box and manual. This was the first device to use the Palm operating system. It was also one of the first to have handwriting recognition (apple also had a device that had handwriting recognition). This is your chance to own a piece of computer history.  I am not sure if it works, its completely untested. See pictures for full details.