Ethernet port 3.5 mm audio-out port The Firecuda Gaming Dock is powered via a dedicated power supply, but Seagate doesn't recommend you use its Thunderbolt 3 ports to feed power through to a laptop. Although you can charge accessories, the 15W supply isn't enough to charge laptops and things that require a bit more juice. The Thunderbolt 3 cable supplied in the box will keep the Firecuda dock powered for accessories and lighting, even if you power off the HDD storage unit itself. It's good that you have the option to turn off the HDD when it's not in use, not only to save on power but because, naturally, it does emit sound.