[. . . ] 4-573-374-11(1) Symptom & Remedy Your Walkman cannot charge the battery or is not recognized on your computer. €¢ The USB cable (supplied) is not connected to a USB connector on your computer properly. [. . . ]  (Startup Guide) The Startup Guide describes the following: • Basic operating instructions of your WALKMAN® • How to access the “Help Guide”, which contains all of the operating instructions and explanations of customer support websites, etc. €¢ How to access useful PC applications websites on the internet While browsing is free, you may be charged a communication fee according to your carrier contract. Depending on the country/region in which you have purchased your Walkman, some models may not be available. Therefore, be aware that there is a risk of damage to your ears or eardrums if strong pressure is applied to the earbuds or the earbuds are suddenly removed from your ears. About the headphones • Avoid playing the unit at so loud a volume that extended play might affect your hearing. €¢ At a high volume outside sounds may become inaudible. Avoid listening to the unit in situations where hearing must not be impaired, for example, while driving or cycling. €¢ As the headphones are of open-air design, sounds go out through the headphones. Notes for using Walkman Note for battery • To prevent battery deterioration, charge the battery at least once every six months or every year. About volume operation (Only for countries/areas complying with European Directives) An alarm (beep) and a warning [Check the volume level] are meant to protect your ears when you turn the volume up to a level that is harmful for your ears for the first time. Note • You can turn up the volume after canceling the alarm and warning. €¢ After the initial warning, the alarm and warning repeat every 20 cumulative hours that the volume is set to a level that is harmful for your ears. [. . . ] Disconnecting From the Home menu of your Walkman, select  [Bluetooth] [Disconnect Audio Device]. , declares that this equipment is in compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC. [. . . ]