Equipped with an IR blaster to change channels, Google TV can sit on top of your existing infrastructure.

配有红外线光束来转换频道，Google电视可以架设在您已有的设施上。

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Still, in a bid to position the Tab 2 (7.0) as a media consumption device, Samsung outfitted it with an IR blaster.

ENGADGET: Samsung Galaxy Tab 2 7.0 review

You'll need a device with an IR blaster to adjust the TV channel or volume, with the app serving as a touchscreen remote.

ENGADGET

As before, they both communicate with your DVR via infrared, but the new Slingboxes no longer require that you tape an IR blaster to your device the IR blaster is built in and designed to reach a nearby device without a wire.

FORBES: New Slingbox Units Let You Bring Your HD TV With You