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Quick Look: The YouTube Roku channel initially rolled out only to Roku 3 devices, but as of April 22, 2014, is now available to all current-generation Roku owners.
On the YouTube channel, you'll find access to predefined video categories and can search videos without signing into to your YouTube account. For the best YouTube experience, however, you will want to pair your device to your account, which is a two-step process that requires you to enter 2 codes shown in the Roku channel on two YouTube websites. After linking, you'll have access from within the YouTube Roku channel to all of your playlists, subscriptions, favorite videos, Watch Later videos, and a history of videos that you've watched within the channel.
Perhaps the most useful feature is the "Send to TV" function. After pairing your Roku to your YouTube account, you'll find a small icon below the bottom right corner of each video you watch on your computer or mobile device:
Click on this icon and the video will immediately play on your Roku-connected TV. This turns your mobile device into a remote control for your YouTube Roku channel.
-- Information is current as of April 22, 2014
Developer's Channel Description: YouTube your way on the biggest screen in the house, from a playlist of music videos to your favorite comedy channels. Send videos from your phone to your TV when they're sharing a Wi-Fi connection. Find a video on your YouTube app, click the TV icon that appears, and it instantly plays on your TV.
CHANNEL STORE CATEGORY: Web Video