Sling TV review: A cheap(er) way to watch live sports, but not the budget streamer it once was
Sling streams entirely in 720p (same as most competing live-TV services), though you may be able to watch "select events" (namely sports) in 4K. However, you need a compatible Apple TV, Amazon Fire TV or Roku device to enjoy that; for whatever reason, Sling's 4K streaming doesn't currently work with Android TV or Google TV.