Vizio M55-E0 VIZIO M55-E0 UHD HDR XLED Plus Display 55"

Buts it not 4K?

3840×2160 pixels = 4k

Yes, it’s 4K.

Photos show a remote being used that has LCD screens?

Oh no. That might be the phone app.

That’s an iPhone. Per the item page:

Intuitive control.
Chromecast built-in lets you command your entertainment and easily stream content from your phone directly to your display.

Review I read mentioned pretty poor input lag, so gamers beware.

Amazon Reviews: