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You have to use both together, that is why you are given the unique antenna to plug into your USB port.
Sorry, there was a problem. Please try again later.You don't have to use the mouse that comes with the MK550 and can use a different one with the keyboard. If your other mouse is a Logitech one that uses a Unifying Receiver---having an orange logo on it---than you can simply pair your keyboard to that mouse's receiver, but only if you use Logitech's Unifying software. Here's a link to the download: https://support.logi.com/hc/en-us/articles/360025297913.
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