It's an old calculator. It belonged to my father, and the details are unknown. I have confirmed that it works. Size: Width: Approximately 12 cm Height: Approximately 14 cm; Approximately 7 cm when closed Thickness: Approximately 1 cm or less when closed There is also some dirt. A sticker with my family name is on the back, but I'm afraid it might break if I try to clean it or remove the sticker, so I will send it as is. Please purchase if you understand. I would appreciate it if you could buy it immediately.