QNAP TR-004. Product type: HDD/SSD enclosure. Number of storage drives supported: 4, Storage drive size: 2.5/3.5", Supported storage drive interfaces: Serial ATA II. Data transfer rate: 3 Gbit/s. RAID levels: 0, 1, 5, 10, JBOD, Hot-swap. Product color: Black. USB connector type: USB Type-C