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radio waves instead of light waves. If you have a garagedoor opener, for instance, you have an RF remote. Remotecontrol Features Today39。s hometheater remotes do a lot more than turn a ponent on and off and control the volume. Here are just a handful of the features you can find on some of the highertech remote controls out there. Universal capabilities Different electronics brands use different mand codes. Some IR remotes are preprogrammed with more than one manufacturer39。s mand codes so they can operate multiple devices (sometimes up to 15) of different brands. If your hometheater setup incorporates ponents from, say, three different manufacturers, you can either use three different remotes to operate your system or use one universal remote. To add functions to a universal remote, you need to know the mand codes for the ponent you want to control. You can look these up online or find them in the manual that came with your remote. Learning A learning remote can receive and store codes transmitted by another remote control。 it can then transmit those codes to control the device that understands them. For instance, let39。s say you have a receiver with its own preprogrammed remote, and you buy a new TV that es with a universal learning remote. The learning remote can pick up the signals your receiver remote sends out and remember them so it can control your receiver, too. You don39。t need to input the mand codes yourself a learning remote picks up and stores the signals another remote sends out. All learning remotes are considered universal remotes because they can control more than one device. Macro mands A macro is a series of mands that you program to occur sequentially at the push of a single button. These macros can be anything you want, such as an activity mand. You can set up a macro that lets you push one button to activate, in order, everything that needs to happen for you to watch a movie or listen to a CD. (Some remotes e with activity mands preprogrammed, and others let you download macros from the I