eSATAp (also known as Power over eSATA, Power eSATA, eSATA/USB Combo, eSATA USB Hybrid Port/EUHP) is a combination connection for external storage devices.
An eSATA or USB device can be plugged into an eSATAp port. Power eSATA is eSATA + USB combo, NOT eSATA or USB port
Expand two eSATAp port from motherboard SATA host
Power by SATA interface from PSU, providing 12V/5V power over the external port ( SATA 15pin to SP4 4pin power adapter cable MUST be connected ) for any 2.5" / 3.5" eSATA devices
The 9pin header on this board must be connected with a 9pin header on your motherboard to make sure the eSATAp have USB 2.0 functions, data transfer speed up to 480Mbps
Plug and play, no driver is needed
Note

SATA 15pin to SP4 4pin power adapter cable MUST be connected to PSU
USB 9pin header cable MUST be connected to motherboard USB 9pin header
Two SATA cables are required (sold separately, do not include in the package)