Sony SRS-ZR7 Help Manual page 244

A device featuring the BLUETOOTH function is required to conform to the BLUETOOTH standard specified by Bluetooth SIG, and be
authenticated. Even when the connected device conforms to the above mentioned BLUETOOTH standard, some devices may not be connected or
work correctly, depending on the features or specifications of the device.
Noise or sound skips may occur depending on the BLUETOOTH device connected with the speaker, the communication environment, or the usage
environment.
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