Amazon.com: Logitech K360 Wireless Keyboard with Unifying Receiver (Blades of Grass Version) : Electronics
Can I use any Logitech Bluetooth mouse in pair with a unifying Logitech keyboard K400 series? If not, what type of Logitech mouse will do? - Quora
Logitech Wireless Unifying USB Receiver Dongle for Keyboard & Mice - AAA Polymer
Restored Logitech K850 Wireless Bluetooth Keyboard PC Mac Chrome + USB Unifying Receiver, (Refurbished) - Walmart.com
Logitech K750 Wireless Solar Keyboard for Windows, 2.4GHz Wireless with USB Unifying Receiver, Ultra-Thin, Compatible with PC, Laptop - Black - Newegg.com
Logitech USB Unifying Receiver Dongle for Mouse & Keyboard 910-005235 (2 Pack) - Walmart.com