[. . . ] At purchase, the attachment for your "WALKMAN" is set into the speaker. [. . . ] Hints When you set [SP Output Optimizer] to [RDP-NWT16] on your "WALKMAN, " the quality of the sound output from the speaker can be optimized. Only this sound quality setting is applied to the speaker, while other sound quality settings are not applied. For details on how to perform playback on your "WALKMAN, " refer to the "User Guide" supplied with your "WALKMAN. " You can also operate your "WALKMAN" with the stand of the speaker closed. Notes The battery power of your "WALKMAN" is consumed during playback. adjust the volume of the speaker with your "WALKMAN" installed. When you detach your "WALKMAN, " volume returns to the default level. You cannot use the FM radio function while your "WALKMAN" is installed into the speaker. [. . . ] Set the sound mode of the "WALKMAN" to normal or flat sound quality. [. . . ]