User manual SONY MDR-RF940RK

[. . . ] Use the headphones near the transmitter. Loud background noise Move closer to the transmitter. As you move away from the transmitter, more noise is likely to be heard. [. . . ] Refer to them whenever you call upon your Sony dealer regarding this product. Wireless system that allows you to listen to a program free from the restriction of a cord within 130 feet from the transmitter. Compact transmitter which operates on battery power and AC power supplied through the supplied AC power adaptor · To avoid damage to the system caused by battery leakage and corrosion; ­ Install the batteries with the correct polarity. ⭠Do not try to recharge the batteries. ­ Remove the batteries if the system is not to be used for a long period of time. In case of battery leakage, wipe off any deposit in the battery compartments before installing new batteries. If a hissing noise is heard when the headphones are used outside of the effective range (see the next section), the mute function will be activated and the sound will not be heard from the headphones. To restore the sound, move near toward the transmitter. When the headphones are not to be used for a long period of time, remove the batteries to avoid damage caused by battery leakage and subsequent corrosion. ⷠWhen the transmitter is not to be used for a long period of time, disconnect the AC power adaptor from the AC outlet holding the plug. Do not leave the wireless stereo headphone system in a location subject to direct sunlight, heat or moisture. Take the headphones off before turning off the transmitter. If you turn off the transmitter first, you may hear some noise. The optimum distance is up to approximately 130 feet (40m) without the system picking up some interference. [. . . ] Be sure to bring the headphones and the transmitter to the Sony dealer when requiring repair work. Open the battery compartment lid on the left inner side of the head band. Turn on the audio/video equipment then the transmitter. [. . . ]