[. . . ] 4-579-796-21(1) About the in-ear headphones The earbuds seal your ears. 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. [. . . ] _________________________ Design and specifications are subject to change without notice.  (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. Notes for using Walkman Note for battery • To prevent battery deterioration, charge the battery at least once every six months or every year. 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. € When you use your Walkman for the first time, or if you have not used the Walkman for a long time, it may take a few minutes to be recognized by the computer. Check that the computer recognizes the Walkman after you have connected it to the computer for about 10 minutes. € If the approaches listed above fail to resolve the issue, turn off your computer completely and disconnect your Walkman. [. . . ] To install it, open [WALKMAN] in your Walkman’s system storage after connecting to your computer. Exe)] Mac user: [FOR_MAC] - [Help_Guide_Installer_for_mac] After installing the software, double-click the shortcut or the alias icon generated on your desktop. [. . . ]