YouTube TV comes already with an all-you can-eat DVR. But now, you can also download videos for offline viewing.

The new 4K Plus feature is $19.99 per month. This is because it includes 4K streaming of live television. This is in addition to YouTube TV’s current monthly price of $64.95, which gives you access to more than 85 channels, including CNN, Disney, Fox News Channel and MSNBC.

For 30 days, YouTube TV customers who have YouTube TV can get 4K Plus free of charge. Sign up now to get the new features for $9.99, before the $19.99 regular price.

YouTube will also add 5.1 Dolby surround sound to its streaming devices. This feature will be available in select streaming devices starting in the next few weeks, Kathryn Smith, product manager at YouTube TV, stated in a blog. She said that surround sound audio will enhance the experience of watching movies and make it feel more like you’re in the theater.

4K Plus subscribers get unlimited streaming on their home WiFi network (the standard subscription gives you three.

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Fans of the Olympics may find 4K and Dolby surround sound useful. NBC will broadcast primetime coverage in 4K HDR and Dolby Atmos sound. You can also watch live competition on the Olympic Channel and Golf Channel, both on YouTube TV.

You can search for “4K” in YouTube TV right now. Most of the results come from Discovery 4K or Nat Geo in 4K. Tastemade in 4K is also included. According to the service’s guide, there is no 4K sports broadcast by NBC, Fox Sports, or ESPN in the next 8 days.