Used QNAP NAS TS-231. This item is being sold because I upgraded. It was used in RAID1 configuration and operated without any issues until the end of September 2025. The HDDs have been removed and the device has been reset for this sale. HDDs are not included. The NAS unit and AC adapter are the items for sale. The hardware specifications are excerpted below. Please refer to the QNAP website for detailed specifications, including software information: https://www.qnap.com/ja-jp/product/ts-231 CPU: ARM v7 Cortex A9 dual core 1.2GHz DRAM: 512MB Flash Memory: 512MB HDD: Supports 2 HDDs, hot-swappable LAN Port: 2 x Gigabit RJ-45 Ethernet ports USB: 3 x USB 3.2 Gen1 ports (1 on the front, 2 on the back) eSATA: 1 x eSATA port (on the back) I do not smoke, and I do not have any pets.