3.5" SATA/SAS Mobile Rack Interface: SAS or SATFull Metal Body80/92mm cooling fan for excellent heat dissipationIndividual led & cooling fan only “ON” with drives installed3 Mode Fan Speed Jumper of high / low / offSupports 3.5″ & 2.5″ HDD/SSDHigh Performance Transfer Rate : 6.0Gb/sModel MB155SP-B(5HDD in 3*5.25″ Bay)Model MB154SP-B(4HDD in 3*5.25″ Bay)Model MB153SP-B(3HDD in 2*5.25″ Bay) Chassis Sliding Rail Kit 18"/24" (EYESLR18/EYESLR24)