The reviewer is correct. The only time you get combo is when you buy a Keyboard+Mouse set, or you use products that work with the Logitech Unifying Receiver.

For example, I have both a Performance MX and a K520 connected to my laptop solely through 1 Logitech dongle.

I want to buy the Microsoft [Arc Mouse](http://www.microsoft.com/hardware/en-gb/p/arc-touch-mouse) and [Arc Keyboard](http://www.microsoft.com/hardware/en-gb/p/arc-keyboard/J5D-00007), but I noticed [this review](http://www.trustedreviews.com/Microsoft-Arc-Keyboard_Peripheral_review) (for the keyboard) says: "The only downside is that you can’t share a dongle with another Microsoft peripheral"

That can't be right... can it?

I know the mouse and keyboard will each come with their own wireless dongle, but surely I can use one dongle for both keyboard and mouse? Is that reviewer correct?

2 peripherals, 1 Dongle