This is an external HDD case that can connect up to 4 SSDs and HDDs. It's in very good condition as it has hardly been used. The original box and all accessories are included. MARSHAL SATA 3.5/2.5 inch HDD External Case HDD TOWER 4 MAL-3035SBKU3 ● Features a built-in AC adapter as requested by users, allowing for the installation of 4 SATA 3.5-inch HDDs. You can use four 3.5-inch SATA HDDs. Also, the AC adapter is the built-in type, which is a popular request from users, so it won't get in the way, and you can keep your outlets tidy. ● Easy expansion with no tools required, screwless design. You can easily insert and remove 3.5-inch SATA HDDs without tools. Also, the HDDs can be fixed with the included jig on the dedicated tray, so you can use it without screws. * When using 2.5-inch HDDs/SSDs, you need to fix them with the included screws. ● Supports 20TB HDDs, achieving a maximum of 80TB! You can use four 20TB SATA 3.5-inch HDDs, for a total of 80TB. * Your OS must support GUID partition (GPT) to create volumes exceeding 2TB. * RAID function is not included. ● Equipped with individual HDD power switches. You can turn the power of the installed HDDs/SSDs on and off individually. You can switch them one by one even while using other HDDs/SSDs, cutting down on wasted power. * When switching the power with the individual HDD switches, be sure to turn off the power with the POWER button on the front of the main unit first, and then switch the individual HDD switches. This can cause HDD failure. ● Equipped with a cooling fan with adjustable airflow. You can easily switch the cooling fan's airflow with a switch. It has 4 levels (it is also possible to stop the rotation). The body has excellent heat dissipation. It cools down the heat generated by the drives and allows for stable operation. ● PC power link function. It is equipped with a "PC power link function" that stops the HDD rotation immediately when the PC or TV power is turned off, so you don't waste power.