Logitech USB Unifying Receiver
A bit of helpful tip before you buy a Logitech keyboard or mouse. Logitech basically have two types of connections for connecting keyboards and mouse.
Some of their devices are compatible with something called the "Unifying Receiver" this means that you can connect two devices such as keyboard and mouse to one USB receiver.
Other devices do not connect to a unifying receiver and instead connect to something called a nano received. The nano receiver is unique per device so will not connect to another keyboard or mouse from logitech other than the one it came with.
So the most popular MK270 combo that Logitech have is not compatible with a unifying receiver so if you damage your receiver, you cannot go out and buy a new receiver for your keyboard or mouse.
And vice-versa if you damage your mouse from the combo set of MK270, you cannot just buy a replacement mouse that can connect to same receiver. You will have to buy a new receiver too for your mouse unless one comes with it, but that is a big problem because you will now have the old nano receiver for your keyboard plugged into a USB port as well as a new receiver plugged in for your mouse. Two ports are now occupied on your computer which is horrible to think about.
But if you bought unifying devices then you would only need one receiver to connect them all so in the future if you damage your keyboard you can just buy another keyboard and connect to same unifying receiver.
Logitech mark their devices that are unifying with a star symbol like the one shown below so if a keyboard or mouse has this symbol, it means it can connect to one receiver. Be careful on Logitech website and check reviews to make sure it is unifying.
![USB Unifying receiver 1](https://assets.logitech.com/assets/65172/usb-unifying-receiver.png)
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