Take note if you are a using a Logitech Unifying USB dongle, they are wildly insecure - HardwareZone.com.sg
Logitech Unifying Empfänger - digitec
Genuine Tiny Unifying USB Receiver Dongle for Logitech Mouse and Keyboard Can Connect Up To Six (6) Devices w/ Unifying Logo|usb mouse and keyboard|logitech usb keyboardusb mouse keyboard - AliExpress