Fs305-12g three 5.25' Device bay to five 3.5' -12g/ sata-6gbit/s trayless hot-swap cage. Fits five 3.5' -12g/sata-6gbit/s drives in three 5.25' Device bay. Adjable drive status LED and fan control system. Trayless & sless design. Individual metal key lock for each drive for extra security. All aluminum body with beautiful hairline brushed Finish. Independent drive status LED. Built-in cooling fan for excellent heat dissipation. Fully supports hot-swap function