Logitech Unifying Receiver for Connecting Multiple Devices
Amazon.com: Original USB Unifying Receiver for Mouse and Keyboard, Unifying Receiver for Up to 6 Devices Support M215 M235 M325 M545 : Electronics
Amazon.com: Logitech New Unifying USB Receiver for Mouse Keyboard M515 M570 M600 N305 MK330 MK520 MK710 MK605 : Electronics
New Logitech Unifying USB Receiver for.M905.M600.M525.Mouse.&.K350.K750.Keyboard | eBay
Connect multiple Logitech wireless devices using same USB receiver
How to Pair Logitech Mouse/Keyboard with a Different "Non-Unifying Receiver" - YouTube
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