Amazon.com: Logitech C-U0007 Unifying Receiver for Mouse and Keyboard Works with Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) : Electronics
Amazon.com: Logitech USB Unifying Receiver - 2 Pack : Electronics
Logitech New Unifying USB Receiver for Mouse Keyboard M515 M570 M600 N305 MK330 MK520 MK710 MK605 - Walmart.com
Zone Wireless Audio Receiver
Replacement 6 Channel USB Receiver Dongle For Logitech Unifying Keyboard/ Mouse | eBay