Supports 4x 2.5' SAS/SATA HDDs/SSDs (up to 9.5mm drive height) Install into any standard external 5.25' drive bay Supports SATA 6Gbp/s transfer speeds & SAS up to 12Gbp/s (SAS host required) Tray-less and door-less design for hot-swapping bare drives without tools or screws Reduce cable clutter by using a single 15-pin SATA power connection to power four drives