Logitech Wireless Touch Keyboard K400 Plus (Unboxing) - YouTube
Logitech K400 Plus Wireless Touch TV Keyboard With Easy Media Control and Built-in Touchpad, HTPC Keyboard for PC-connected TV, Windows, Android, Chrome OS, Laptop, Tablet - Black - Newegg.com
Logitech K400 Plus Wireless Touch Keyboard - German Layout - White
Logitech K400 Plus Touchpad Keyboard for TV connected PC
Logitech K400 Plus Touchpad Keyboard for TV connected PC
User manual Logitech K400 Plus (English - 2 pages)
Logitech K400 Plus Touchpad Keyboard for TV connected PC
Logitech Unifying receiver - Wikipedia
SOLVED: USB for wireless Logitech keyboard lost. - Logitech Harmony Smart Keyboard - iFixit