The power for the station drives is supplied by a separate power adapter supporting the 100-240V input voltage. Please, note: 1) the SATA port of the PC/laptop motherboard, which you connect the docking station to must support the Port Multiplier function for your PC to recognize multiple hard drives installed in the HDD enclosure 2) you can use only one interface at a time (either USB 3.0 or eSATA). Another important feature of this Mediasonic hard disk drive enclosure is the availability of the button, by pressing which you can quickly switch between the USB 3.0 and eSATA external interfaces. The cooling system of this HDD enclosure model has two modes, automatic and manual, therefore you can either set the fan speed (three levels) manually or let the system do it automatically. The cooling system of this external hard drive enclosure includes a built-in temperature sensor that accurately monitors the installed drives temperature. One of the main features of Mediasonic ProBox docking station is the cooling system, which maintains an optimal temperature of the hard drives during the operation.