Fits four 3.5" SAS-12G/SATA 6Gbit/s drives in three 5.25" device bayAdjustable drive status LED and fan control systemTrayless & screwless designIndividual metal key lock for each drive for extra securityAll aluminum body with beautiful hairline brushed finishIndependent drive status LEDBuilt-in cooling fan for excellent heat dissipationFully supports Hot-Swap functionModel and front bezel with plastic clip buttonForm factor5.25" drive bay x 3Drive support4 x 3.5" SAS*/SATA HDD or SSDTransfer rateUp to 12 Gbit/s (dependent on drive speed)Host interface7-Pin SATA connector x 4 or SAS* primary channel connectionPower connectorSATA 15-Pin x 2Drive door securityTriangle metal key lock designLED indicatorPower ON : BlueAccessing : Purple blinkingNumber of key2Switch buttonFan speed : High/LowHDD LED : ON/OFFCooling fan80mm fan x 1, 3000rpmNet weight1.45kgDimension146mm (W) x 126mm (H) x 199mm (D)