Logitech 910-005235 USB Unifying Receiver 97855133991 | eBay
Logitech - USB Unifying Receiver - USB Dongle - for Mouse & Keyboard | eBay
Genuine Tiny Unifying Usb Receiver Dongle For Logitech Mouse And Keyboard Can Connect Up To Six (6) Devices W/ Unifying Logo - Keyboards - AliExpress
Amazon.com: Logitech New Unifying USB Receiver for Mouse Keyboard M515 M570 M600 N305 MK330 MK520 MK710 MK605 : Electronics
Logitech M510 Wireless Computer Mouse – Comfortable Shape with USB Unifying Receiver with Back/Forward Buttons and Side-to-Side Scrolling Blue 910-002533 | Fast Server Corp. www.srvfast.com