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Infrared remotes only work by line-of-sight, so you have to be in a position where there is nothing blocking the remote or the sensor. Also, many television remotes have poor ergonomic design: the center of gravity is near the bottom of the device, but the most-frequently used buttons are near the top, so it's not unusual to have to use two hands, or hold the remote from the front and operate it awkwardly with the index finger, rather than holding it in the palm of the hand and pressing buttons with the thumb.
People don't complain about these problems because they have become so adapted to them.
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What type of household item measures 10 centimeters?
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IR (infrared) remote controls are considered line of sight, meaning the remote has to "see" the device it is controlling. An RF remote is not because the signal has the strength to pass through some objects.
Can computers interfere with remote controls?
Not at all.
