Amazon.com: Logitech 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
Logitech K540 Wireless Keyboard With Unifying Receiver Very Good 5465 | eBay
Amazon.com: Logitech 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
Logitech MK540 Full-size Advanced Wireless Scissor Keyboard and Mouse Combo for PC Black 920-008671 - Best Buy
920-008682 | Logitech MK540 Advanced Keyboard and Mouse - Black | Techbuy Australia
Why you should really, really update your Logitech wireless dongle - The Verge
Logitech Mk540 Wireless Keyboard Mouse Combos With Unifying Usb Receiver Mice Keys Set For Pc Laptop Office Business Game - Keyboard Mouse Combos - AliExpress
Logitech Standalone USB Unifying Receiver (910-005235)
Logitech Unifying Receiver for Connecting Multiple Devices