Not as cheap as pricing error from earlier this year but good price nonetheless. Possible 5% further discount via OW price match.
Key Features
The K600 TV is the smarter way to control your Smart TV – with an integrated touchpad and D-Pad so you can search, type, find, and unwind.
Compatible devices
Samsung:
SUHD / UHD (Tizen – 2016+)
LG:
OLED / SUHD / UHD (WebOS – 2016+)
I've used the K400 quite successfully with Android TV using a unifying dongle. It allows you to use a bunch of games/apps that require a mouse/keyboard/touch, including a bunch that I sideloaded like Settlers of Catan, Scotland Yard, Carcassonne.
This says both Bluetooth and unifying in the description, plus a comprehensive range of OS's, so this should work with almost anything, at worst needing a Logitech unifying dongle.
The home and back buttons are good for Android.
Bluetooth®
Windows® 8, 10 and above
macOS 10.12 and above
WebOS (LG) v3.5 or later
Tizen (Samsung) v2.4 or later
Android 5.0 or later
iOS 5 and later
Unifying
Windows® 7, 8, 10 or later
macOS 10.11 and above
WebOS (LG) v3.0 or later
Tizen (Samsung) v2.4 or later
Chrome OS™
USB port or Bluetooth low energy technology enabled device with keyboard support