This is a Sharp pocket computer, the PC-G850V. I used this during my student days. It's been stored in a dark place for nearly 25 years. I've put in new batteries and confirmed it turns on, but I can't guarantee it works perfectly. I've forgotten how to use it. I pressed various keys, and it seemed to be working fine. The keys themselves don't show much wear and are in good condition. - There's a white pattern on part of the LCD screen (see the photos). - There's rust in one part of the battery compartment. - Four AAA batteries are included. - The box is also available, but it's very damaged, so I will dispose of it. I will package it to prevent water damage and wrap it in packing material for shipping. Shipping method: - Rakuraku Mercari Bin (Nekopos) Pocket computer