Sony SRS-ZR7 Help Manual page 202

To enjoy a more dynamic sound
Pull the lever on the bottom of the speaker in the direction of the arrow shown in the illustration below to remove the grille.*
* After removing the speaker grille, do not touch the exposed part of the speaker (speaker units), and keep the removed grille on a flat surface to prevent
distortion.
What you can do with the speaker during playback
You can adjust the volume using the -/+ (volume) buttons.
Hint
After SongPal is downloaded and installed to your smartphone, iPhone, etc., you can use it as a remote control.
Note
Files imported by x-app. cannot be played back. Connect the Walkman to the AUIDO IN jack of the speaker, and play back these files on the
AUDIO IN mode.
The speaker supports only audio playback functions of Walkman.
Sony is not responsible for any loss or damage to data in a Walkman that is connected to the speaker.
Correct operation is not guaranteed, even for a supported Walkman.
When the Walkman is connected, sound is not output from its headphone jack.
Related Topic
Listening to music on a device via a USB connection (USB-A)
4-592-259-11(1) Copyright 2016 Sony Corporation
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