The external multi-bay tower series are designed specially for storage applications. The wide variety of the tower with hard drive cages is able to easily max the hard drive capacity up to 4 bays for storing mass data. Optional 120mm cooling fan can be added to enhance the ventilation inside. The external NAS tower chassis with solid construction is a cost-effective and flexible solution for your critical data storage. - Sleek Front Panel with Power On Button - 4x 3.5" Trayless Hotswap Bays - 4mm Aluminum Front Panel - Support 6.0Gb/s SATA/SAS HDDs - First PVC Laminate Technical in NAS Chassis - Compatible with Flex Power Supply - Heavy Duty SECC Construction - Support Standard I/O Slot - Support mini-ITX Motherboard