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 K400 Plus Touchpad Keyboard for TV connected PC
Logitech (K400r) USB Wireless Touch Compact Keyboard w/3.5in Touchpad No Dongle | eBay
Logitech K400 Plus Touchpad Keyboard for TV connected PC
Original Logitech Keyboard K400r K400plus Unifying Mirco Dongle Receiver USB | eBay
Source Original Logitech K400R Wireless 2.4G Touch Keyboard for PC Laptop Computer on m.alibaba.com