[. . . ] This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. [. . . ] (refer to the illustration ?3D Sync Transmitter and 3D Glasses Communication Range. ?) I -  f you use the 3D Glasses out side of the specified range, you may not be able to watch 3D video images. The ? 3D Sync Transmitter signal may interfere with Infrared remote control operation. ?1? Safety Precautions You ? should only use this product for watching 3D video images on a compatible Sony projector. Some people may experience discomfort (such as eye strain, fatigue, or ? nausea) when using this product. Sony recommends that all viewers take regular breaks while watching 3D video images or playing stereoscopic 3D games. The length and frequency of necessary breaks will vary from person to person. If you experience any discomfort, you should stop using this product and watching the 3D video images until the discomfort ends; consult a doctor if you believe necessary. You should also review (i) the instruction manual of your projector, as well as any other device or media used with your projector and (ii) Sony website for the latest information. The vision of young children (especially those under six years old) is still under development. Consult your doctor (such as a pediatrician or eye doctor) before allowing young children to watch 3D video images or play stereoscopic 3D games. Adults should supervise young children to ensure they follow the recommendations listed above. [. . . ] Be sure to connect the 3D Sync Transmitter before turning on the projector in order for the projector to recognize the 3D Sync Transmitter. Refer to projector?s instruction manual for details on how to enjoy 3D viewing. [. . . ]