While many Roku players, including the $50 Roku Streaming Stick Plus, offer 4K resolution, Dolby Atmos audio and standard high dynamic range video, the 2020 Roku Ultra is the first to include Dolby Vision HDR. In CNET's tests Dolby Vision can look a bit better than standard HDR in some cases, but the difference is largely dependent on the TV and the video source. Even so, many owners of Dolby Vision-compatible TVs are likely to want a streamer that can deliver the format. Competing 4K devices with Dolby Vision include the $50 Amazon Fire TV Stick 4K, the $150 Nvidia Shield TV and the $180 Apple TV 4K.
According to Roku, the updated Ultra has a faster quad-core processor, 50% better Wi-Fi range and support for Bluetooth audio so you can stream music and podcasts from your phone to your TV (it will also soon add Apple's AirPlay 2 so you can cast HBO Max from your iPhone or iPad to your TV via the Ultra).
Just note that this unit is slated to go on sale later in November for $70 at Best Buy (and possibly elsewhere). Read our Roku Ultra (2020) review.
Source : https://www.cnet.com/news/the-best-holiday-gifts-under-100-for-2020/
Here you can find information about how to track lost phone with imei number