The "sensor" bar is an IR emitter. It supposedly sends IR signals to the TV, although I would imagine it would have to be oriented in the other direction (or you'd need a mirror on your couch!)
“The other one is a biggie, and it's something very noticeable in the videos: touch sensitivity is pretty bad. Using the virtual keyboard proved to be far too painful, and we're pretty sure it wasn't multitouch-friendly.”
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And how does it control the TV without an IR emmitter in the remote?
The "sensor" bar is an IR emitter. It supposedly sends IR signals to the TV, although I would imagine it would have to be oriented in the other direction (or you'd need a mirror on your couch!)