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 WIRELESS TOUCH KEYBOARD K400 PLUS HTPC keyboard for PC connected TVs - Walmart.com
Logitech K400 Plus Wireless Touch Keyboard - Newegg.com
Logitech K400 Plus Wireless Touch Pad HTPC Keyboard for PC Connected TVs
What devices can I pair with my Logitech unifying receiver, other than a mouse and keyboard? - Quora
Amazon.com: Unifying Receiver for Mouse and Keyboard Compatible for Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) 2pk : Electronics
Amazon.com: Logitech New Unifying USB Receiver for Mouse Keyboard M515 M570 M600 N305 MK330 MK520 MK710 MK605 : Electronics
Logitech K400 Plus Touchpad Keyboard for TV connected PC
Logitech K400 Plus did not come with a USB dongle? Wait!! It's hidden in the box!! | THINKBOX
Logitech Unifying receiver - Wikipedia
Genuine Logitech Unifying Mirco Dongle Receiver USB For keyboard K400r K400plus | eBay