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Remote controls for televisions are so commonplace now that it's hard to imagine televisions without them. Many televisions today need a remote control to perform much of the configuration functions so they are a vital part of the television. There was a time when televisions didn't have remote controls of any time. It was during the 1970s that the very first remote controls were introduced. Before that time, a handful of channels could be selected using mechanical switching so remote controls weren't an option. As tuning became fully electronic, some very basic remote controls were included on some larger televisions. The very first remotes used a single button to scroll through the channels. Although some used infra red, most were ultra sonic, emitting sound pulses in excess of 30KHz (the limit of hearing is around 18 - 20Khz). Infra red remote controls were introduced during the 1980s and since then, have grown in complexity to become the full function systems we know today.

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