Sony SRS-ZR5 Help Manual page 190

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
Sony is not responsible for any loss or damage to data in a USB flash drive that is connected to the speaker.
Do not disconnect a USB flash drive during operation. To prevent damage to data, stop playback, then turn off the power of the speaker before
disconnecting the device.
Sony does not guarantee correct operation when a USB hub or USB extension cable is used.
When you connect a USB flash drive, the speaker starts reading all the data stored on it. Reading files may take some time.
Operation may become slow depending on the USB flash drive.
Related Topic
Listening to music on a device via a USB connection
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