Logitech Unifying receiver

The Logitech Unifying Receiver is a small dedicated USB wireless receiver, based on the nRF24L-family of RF devices,[1] that allows up to six compatible Logitech human interface devices (such as mice, trackballs, touchpads, and keyboards; headphones are not compatible) to be linked to the same computer using 2.4 GHz band radio communication.

[3] A newer receiver named "Logitech Bolt" was released in 2021 that promises lower latency but is incompatible with Unifying products.

This multi-computer function is further augmented by Logitech Flow (software KVM solution) which is similar to Synergy.

[4] Some older Unifying devices [specify] limit the number of allowable pairing changes to a maximum of 45 times.

For users who often switch a Unifying device between multiple PCs or laptops with individual receivers, this connection limit can become an issue.

Pairing software is available from Logitech for Microsoft Windows and Mac OS X. Wireless devices using the Unifying Receiver are supported since Linux 3.2.

The exploit takes advantage of a user's vulnerable Logitech Unifying Receiver and unencrypted signals within a range of about 100 meters.

[8] A firmware update for Unifying receivers addressing the "Encryption Key Extraction Through USB" vulnerability (CVE-2019-13054/55) was released on 28 August 2019.