It's the K830 that's backlit with the built in touchpad.
I have it, whaddya want to know?
Ah, OK, you'll want one of these: https://www.amazon.com/Logitech-Wireless-Keyboard-Control-Touchpad/dp/B014EUQOGK/ or if you're willing to spend a little more: https://www.amazon.com/Logitech-Illuminated-Living-Room-Keyboard-Touchpad/dp/B00ZOPVSKW