Does it also work on a MacBook Pro and do i need to plug in the power for it to function or can it just run of the USB 3 port alone?

I normally use it with a surface 3, but I have a MacBook pro running mavericks. So I connected the adapter to the mac and everything worked fine. The mouse, keyboard, a 5TB external (powered) drive and USB (no external power) DVD drive. All worked with or without the power plugged-in to the adapter. Though admittedly I did not push it hard on I/O for example, just enough to see that it worked. The Ethernet connection does not just work. I think one has to install the software that came on the CD/DVD. I did not try it out but I presume it would work?

Can I use this to attach multiple usb devices (HDD, printer) directly to an Ethernet switch without a PC?

No, that is not supported. Only the PC that this adapter is plugged into can use the Ethernet port. For example, if you attach a HD to this adapter, the HD cannot see or use the Ethernet port. The PC operating system can read the HD, and can also use the Ethernet. Therefore, the PC can read the files from the HD and send them over the network, but the HD itself cannot use the Ethernet port.

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StarTech.com ST3300GU3B USB 3.0 Hub with Gigabit Ethernet Adapter - 3 Port - NIC - USB Network Adapter - USB Ethernet Dongle - USB Lan Adapter

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TAA Compliant
Provides three USB 3.0 hub ports, with support for up to 5 Gbps
Gigabit Ethernet port (RJ45) with Wake-on-LAN (WOL) support
Aluminum casing with a compact, slim, and lightweight design for maximum portability
Dongle-style combination adapter with built-in USB 3.0 cable
IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3az compatible
Supports 10/100/1000 Mbps half and full-duplex operation
Backward compatible with USB 2.0 and 1.x devices
Universal Power Adapter (NA/UK/EU) included

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Add 3 external USB 3.0 ports w/ UASP and a Gb Ethernet port to your laptop throu

Model
Brand	StarTech.com
Part Number	ST3300GU3B

Details
Type	Aluminum USB 3.0 Hub w/ GbE Adapter
Specifications	Technical Information Host Interface: USB 3.0 Type A Interfaces/Ports Total Number of USB Ports: 3 Number of USB 3.0 Ports: 3 Number of Network (RJ-45) Ports: 1 Software Operating System Supported: Windows XP Windows Vista Windows 7 Windows 8 Windows 8.1 Windows 10 Windows 11 Windows Server 2003 Windows Server 2008 R2 Windows Server 2012 Windows Server 2012 R2 Windows Server 2016 Windows Server 2019 Windows Server 2022 Mac OS X 10.6 Snow Leopard Mac OS X 10.8 Mountain Lion Mac OS X 10.10 Yosemite Mac OS X 10.11 El Capitan Mac OS X 10.12 Sierra Mac OS X 10.13 High Sierra Mac OS X 10.14 Mojave Mac OS X 10.15 Catalina Mac OS X 11.0 Big Sur Mac OS X 12.0 Monterey Mac OS X 13.0 Ventura ChromeOS Linux 2.6.x Physical Characteristics Color Family: Black Product Color: Black Form Factor: External Height: 0.6" Width: 1.7" Length: 3.4" Weight (Approximate): 2.20 oz Miscellaneous Package Contents: Aluminum USB 3.0 Hub w/ GbE Adapter 1 x Universal Power Adapter (NA/JP, EU, UK, ANZ) 1 x Driver CD 1 x Instruction Manual Additional Information: OS Compatibility: Windows® XP, Vista, 7, 8, 8.1, 10, 11 Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016, 2019 macOS 10.6 to 10.15, 11.3 to 13.0 Chrome OS™ Linux 2.6.x and up - LTS Versions only Platform Supported: PC Mac Linux ChromeOS

Additional Information
First Listed on Newegg	September 10, 2014

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StarTech.com ST3300GU3B USB 3.0 Hub with Gigabit Ethernet Adapter - 3 Port - NIC - USB Network Adapter - USB Ethernet Dongle - USB Lan Adapter

Learn more about the Detailed Specifications

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Warranty

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Manufacturer Contact Info

Item#: N82E16817707365

StarTech.com ST3300GU3B USB 3.0 Hub with Gigabit Ethernet Adapter - 3 Port - NIC - USB Network Adapter - USB Ethernet Dongle - USB Lan Adapter

Learn more about the Detailed Specifications

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info