Please be aware that there may be cases where the software does not start properly due to compatibility issues with the main unit. We cannot provide any guarantee for this. The battery backup function is not guaranteed. *This is a used software, so there may be issues with reading the data. *Please understand that this is a used item and has been stored at home. Please purchase only if you understand this. If you are sensitive to such issues or are looking for a perfect item, please refrain from purchasing.