Logitech Unifying Receiver for Connecting Multiple Devices
Amazon.com: Logitech New Unifying USB Receiver for Mouse Keyboard M515 M570 M600 N305 MK330 MK520 MK710 MK605 : Electronics
Amazon.com: Logitech USB Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with all Logitech Unifying Devices like Wireless Mouse and Keyboard, PC / Mac / Laptop - Black : Electronics
Take note if you are a using a Logitech Unifying USB dongle, they are wildly insecure - HardwareZone.com.sg
Logitech Unifying Receiver for Connecting Multiple Devices
Amazon.com: Logitech New Unifying USB Receiver for Mouse Keyboard M515 M570 M600 N305 MK330 MK520 MK710 MK605 : Electronics
Logitech 910-005236 Pico Unifying Wireless Receiver for sale online | eBay
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