The item is unused. Production has already ended, and it is extremely difficult to obtain. ＜Items for sale＞ ・Memory unit: Memory capacity 128KB, 1 piece ・Instruction manual (includes instructions on how to replace the battery, etc.) ・Button battery (discharged and cannot be used) ・Battery replacement screwdriver ＜Notes on purchase＞ ・Since the item is over 30 years old, there is no guarantee of quality. ・If you let me know after purchase, I can open it and check the operation before sending it.