Standard 5.25 -inch CD-ROM bay form factor, fits most ATX/MATX desktop computer cases perfectly; 4 mixed ports: USB-C and USB 3.0 Type-A to cover all common USB peripherals; Equipped with dedicated 20Pin internal cable for direct connection to motherboard USB header; Front exposed design enables convenient plug-and-unplug without accessing rear case ports; Stable 5Gbps high-speed data transfer, plug-and-play without extra drivers