![]() ![]() However, there are universal remotes, which emulate the remote control made for most major brand devices. ![]() The remote control code, and thus the required remote control device, is usually specific to a product line. They are used to adjust various settings such as television channel, track number, and volume. Remote controls for these devices are usually small wireless handheld objects with an array of buttons. They control functions such as power, volume, channels, playback, track change, heat, fan speed, and various other features. ![]() Present-day remote controls are commonly consumer infrared devices which send digitally-coded pulses of infrared radiation. The standard symbol used to denote that it uses infrared as a way to send the signal to devicesĮarly television remote controls (1956–1977) used ultrasonic tones. ![]()
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