The Logitech Unifying receiver is a small dedicated USB wireless receiver, based on the nRF24L-family of RF devices, that allows up to six compatible Logitech human interface devices to be linked to the same computer using 2.4 GHz band radio communication.

What do you do if you don't have a unifying receiver?

Option A: Download Logitech Unifying Software

If you don't have a Unifying dongle, you can buy one for $15. Logitech Unifying dongles are designed to manage the connection for six or seven wireless Logitech products at a time so long as the products are also marked with the orange Unifying logo.

How do I connect my Logitech mouse without Unifying receiver?

On Logitech's modern mice, you can press the easy switch button to swap the channel and choose the right channel for the device you use. You can then switch between one device or another by changing the channel. If the light on the mouse is steady, the connection has been established.