This is the Sharp PA-375 Kana electronic memo, released in 1989. It has a phone book function, a schedule function, and a calculator function. The calculator function has a 10-digit display with memory, so I think it can be used as a regular calculator. Operation has been confirmed, and the power on/off and character input work. It will be shipped with a new battery (CR2016) installed, so you won't need to replace it for a while. Size: Approximately 108 x 68 x 7.2mm This is a used item. There is no box, but the instruction manual will be included.