Logitech K400r Wireless Keyboard Multi-Touch Touchpad. NO Receiver | eBay
What's the difference between Logitech's wireless keyboard “K400r” and the “ K400 Plus”? - Quora
Amazon.com: CM Ultra Thin Silicone Soft Keyboard Cover Skin Compatible with Logitech Wireless Touch Keyboard K400 Plus (Not for Old Version K400 & K400r) (Aqua Blue) : Electronics
Logitech updates the best Fire TV keyboard with the release of the K400 Plus | AFTVnews