This Power Over eSATA cable by Delock enables you to connect different devices with standard eSATA, USB-B or MD4 interface, e.g. external enclosure. The eSATAp port combines USB and eSATA and can provide up to 12V to your devices, when you connect it to a free 12V eSATAp port of your notebook or PC. Thus you do not need an extra power supply for 3,5” external enclosure which are compatible with this cable (MD4). Furthermore this cable is also suitable for 2,5” Combo enclosures with eSATA and USB-B ports, when you connect the cable to a 5V eSATAp interface.