SISUN HD - PW4101 3.5" Full Aluminum Floppy Drive Slot 4 x SATA HDD Power Switch Control / Protection cover Control and switch the power of internal SATA HDD/ODD separately, connect up to 4 X SATA HDD at the same time HDD working status LED indicator. you can install different operating system on your computer Power off the HDD which is not in use to protect hard drive and it will prolong the HDD life Full Aluminum Wire Drawing Process, offer Excellent HEAT Dissipation. 8 capacitance, overvoltage and overcurrent protection. Protection cover, can reduce the electromagnetic interference and into the dust.