This is a 4-bay multi-HDD enclosure with a high-speed USB 3.2 Gen 2 connection. Each bay has its own independent power button. According to the manufacturer's specifications, each bay supports up to 20TB, allowing for a total capacity of up to 80TB. This model does not have RAID functionality. The enclosure is made of an aluminum body for high heat dissipation. Product: 3.5-inch x 4-bay HDD enclosure Manufacturer: Century / CENTURY Model Name: Rakujo no Capsule Hotel (Naked Clan Capsule Hotel) Model Number: CRCH35U32CIS Features: USB 3.2 connection, independent power switches Connection: USB 3.2 Gen 2 Supported OS: Win / Mac Product Contents: Everything shown in the photos. The original box, manual, key, and USB cable are missing. The sale includes only the main unit and the power cable. Product Condition: Used. There are scratches and minor imperfections from use on the exterior. I have attempted to verify the operation, but due to the nature of precision equipment, I cannot guarantee against malfunctions. For peace of mind, I have confirmed the operation of copying 1GB of data on the top and bottom bays. The power button operation for each bay is as follows: ON: press for 1 second, OFF: press for 3 seconds. However, only the bottom two access LED indicator lights on the front do not illuminate. There is no problem with data recording itself, but because it is not perfect, I am offering it at a reduced price. I do not smoke. It was stored indoors in an air-conditioned environment, away from direct sunlight. I only used it for one month, but it was stored carelessly on a metal rack, so I have described it as having some scratches and dirt. Requests: I am unable to provide technical information or support. Please understand the described condition and that this is a used item. I would appreciate it if you could purchase it if you are able to handle it yourself. Please check the manufacturer's website for details on functions and specifications.