DIRECTV R16NC-500 User Guide - Page 72

System Setup IR/RF Setup Certain remote control models feature RF (radio frequency) capability. Refer to the model number printed on the top left corner of your DIRECTV Remote Control. A letter R at the end of the model number (which may be followed by other letters) indicates that the remote supports radio frequency. If no letters follows the number, the remote works in IR mode only. If you have a remote with RF capability you can change the remote's signal from Infrared (IR) to RF. While the IR signal requires a clear line of sight to the front of the receiver, RF signals let you put your receiver inside a cabinet or behind solid doors and still be able to command it from up to 200 feet away. Note: Not all DIRECTV Receivers are RF-capable. Receiver Mode Select "Receiver Mode" if you want to use one remote to command a second DIRECTV® Receiver. Audio Select "Audio" to make a persistent change to your audio settings. Audio options include: Language: Select your preferred audio language, i.e. English, Spanish, Chinese, etc... Sound Effects: Select the volume of sound effects 72 DIRECTV® PLUS DVR USER GUIDE