can i connect nintendo switch and imac with the item?

I know it works with the Nintendo Switch. That is what I use it for. Not sure about the iMac but it does come with a driver so, depending on which iMac and OS you are using, it may work.

Does it work with xbox? my ethernet port in my xbox one x broke

This device is primarily intended to "replace" the internal Ethernet adapter located on the motherboard inside a PC. It may or may not work on any particular device other than a standard personal PC capable of running MS Windows. To answer your question one would need to know what kind of connection you are trying to make to your Xbox. For example, are you trying to connect the Ethernet port on your computer to the Xbox? Or are you simply trying to connect your Internet modem directly to the xBox? If you are simply trying to fire up your xBox with an Internet connection, this raises another question: Why can't you simply use an Ethernet cable to directly connect your Xbox to your Internet modem? Is there some reason to suspect that your xBox has lost its capability to connect to the Internet? If so, there is a good chance the UGREEN USB Ethernet Adapter might not work for this because your xBox will only be compatible with the UGREEN USB Adapter if the xBox has a motherboard that appears to anything you connect to it EXACTLY as a PC computer running MS Windows. Your best way to figure this out is to contact tech support for your xBox and/or tech support at UGREEN and ask them if the xBox is, in fact, a fully PC-compatible "Windows" computer designed for a special purpose (gaming). If so, you may be in luck. But my gut feeling is that your xBox is NOT a kind of PC computer, but is one of many types of computer-like devices that can connect to the Internet such as "smart" phones, or TV streaming devices such as a Roku. FWIW - I have no reason whatsoever to believe that the UGREEN USB has been designed to work with smart phones, TV streaming devices, or ANYTHING that is not a "Windows PC computer". But I could be wrong, which is why I recommend you call one of the tech support services I recommended at the start of this response to your question. Which brings us back to your specific question: Why to you need to connect a UGREEN USB Ethernet modem to your xbox? Is it because your xbox is getting old and no longer works when you try to connect it to the Internet? If that is the case, the only thing that will work for you is to buy a new xBox or similar stand-alone gaming device. (Sorry to be the bearer of bad news).

Color	Space Grey
Item Weight	60 Grams
Item Dimensions L x W x H	2.4"L x 0.9"W x 0.6"H
Data Link Protocol	IEEE 802.3, USB, Ethernet, Gigabit Ethernet
Data Transfer Rate	1 Gigabits Per Second
Compatible Devices	Laptop
Hardware Connectivity	USB 3.0 Type A

UGREEN USB to Ethernet Adapter, Plug and Play Ethernet Adapter, Aluminium Shell, 1Gbps Gigabit RJ45 to USB 3.0 Network Dongle, Compatible with Nintendo Switch, Laptop, MacBook, Surface Pro, Windows

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