Sony SRS-ZR7 Help Manual page 38

Using two speakers (Wireless Stereo)
Pair two speakers together to create wider, stereo sound.
Software updating information
The update of this speaker is scheduled for June 2016 or later. Details are shown below.
Functions to be updated
Wireless Surround function
Wireless Stereo function
The update timing is subject to change.
The software version of the speaker and SongPal can be viewed using the SongPal application.
For how to update the software of the speaker, see
When using the Wireless Surround function or Wireless Stereo function
For details about the functions and compatible models, refer to the following URL.
http://sony.net/nasite/
Be sure to update the software of compatible devices. For details, refer to the operating instructions supplied with the
device.
To use the Wireless Surround function or Wireless Stereo function, two speakers compatible with these functions are required.
4-592-259-11(1) Copyright 2016 Sony Corporation
Update timing Software version
Personal audio system: 2.00 or later
June 2016 onwards Soundbar, Home Theater System: M34.R.2000 or later
SongPal: 4.0 or later
"Updating the pre-installed software."
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