After three years of wrangling, Roku and YouTube have finally come to terms on a pact that will add access to the No. 1 Internet video site to the latest generation of the Roku set-top boxes.

The YouTube channel launched Tuesday on the Roku 3 in the U.S., Canada, U.K. and Republic of Ireland. The YouTube app for Roku provides support for HD streaming, and a "send to TV" feature that lets users initiate video playback from a smartphone.

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The issues in the standoff between YouTube and Roku aren't clear. YouTube may have previously viewed Roku's channel-aggregation strategy as competitive.

Roku, which says it has sold more than 5 million boxes, previously provided a YouTube channel but was forced to remove it in 2010.

Roku offers more than 1,000 channels, including Netflix, Hulu Plus, HBO Go and Amazon Instant Video. The company, whose set-top was spun off from a project initiated by Netflix, competes with other Internet streaming devices, including Apple TV and Google's Chromecast.

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