[. . . ] – Avoid exposure to temperature extremes , direct sunlight , moisture , sand , dust or mechanical shock. 1 Remove the old earpad by pulling it out of the groove on the housing. Usage time1) 25 hours3) Notes on headphones To reduce the risk of hearing damage Avoid using headphones at high volume. If you experience a ringing in your ears, lower the volume or discontinue use. [. . . ] Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. For the state of California, USA only Perchlorate Material - special handling may apply, See www. Before listening To reduce the risk of hearing damage, first lower the volume. € The battery capacity may decrease if the headphones are turned on and placed on the transmitter with the AC adaptor disconnected. € The transmitter automatically turns off while charging the headphones. € If the headphones are used outside the recommended temperature range, the CHG indicator flashes and charging stops. charge in an environmental temperature of between 5°C and 35°C (between 41 °F and 95 °F). € If you haven’t used the headphones for a long period of time, the life of the rechargeable battery may become short. This will improve when you repeat the charging and discharging process several times. € When the battery life reduces to half, this may be the end of battery lifetime. For how to change batteries, consult your place of purchase or a Sony dealer. € Do not store the headphones in hot places for a long period of time. When storing them for more than a year, charge the battery once a year to prevent over discharge. € Charging may not be completed if the transmitter’s contact pins and headphones’ contact points are dusty. € If you connect the transmitter to an A/V component using the headphone jack, raise the volume level on the connected A/V component within the range where the sound is not distorted. € Change the radio frequency with the CHANNEL selector on the transmitter, then press the AUTO TUNING button on the right housing of the headphones. € Use the headphones near the transmitter, or change the position of the transmitter. If the power indicator is still off after charging, take the headphones to a Sony dealer. 0 W Operating temperature 5°C to 35°C (41°F to 95°F) RF stereo transmitter (TMR-RF985R) Distorted or intermittent sound (sometimes with noise) – Charge the headphones. If the power indicator is still off after charging, take the headphones to a Sony dealer. € Use the headphones near the transmitter, or change the position of the transmitter. € If you connect the transmitter to an A/V component using the headphone jack, lower the volume level on the connected A/V component within the range where the sound is not distorted. [. . . ] The headphones convert the received RF signal to an audio signal and decompresses it. Transmitter unit dynamic range Note This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. 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. [. . . ]