If there is still no audio, try pairing the headset or speakerto another computer or to a cellular phone that has Bluetooth audio streaming capabilities and supports the Advanced Audio Distribution Profile (A2DP). Although uncommon, it’s possible that two devices are successfully paired, but refuse to connect. If you’re sure this is not caused by a low battery level or a mismatch of Bluetooth profiles, delete the pairing information and pair the devices again to solve this glitch. You can delete ( Forget / Remove device) Bluetooth pairing information in your phone’s or computer’s Bluetooth menu. Do not get the headset wet. If you touch the headset with wet hands, or put the headset in a damp article of clothing, the headset may get wet and this may cause a malfunction of the headset. For more information regarding Bluetooth connection with Walkman, Headphone, Computer or Sound Bar, refer to:

The headset can be paired with multiple devices, but can only play music from one paired device at a time. Tap Disconnect to disconnect your device but keep its pairing information, or Forget to delete its pairing information. If you have any questions or problems concerning this headset that are not covered in this manual, please consult your nearest Sony dealer.The Bluetooth device you’re trying to connect to may not show up in the Bluetooth list if it’s already connected with a different device (e.g. a relative's phone might already be connected to your speaker or headphones without you noticing). You need to disable that connection first.

There are transmitting and receiving Bluetooth devices. Your phone can send music to a speaker, but not the other way around. The above procedure is an example. For details, refer to the operating instructions supplied with your Android smartphone.Turning Bluetooth OFF and ON again is especially useful when the device you want to connect to doesn't appear in the Bluetooth menu list. Turning Bluetooth OFF and ON again refreshes the list. This tip applies to smartphones, computers and TVs. If you store the headset for a long time, charge the battery to its full capacity once every 6 months to avoid over discharge.

Alternatively, search for 'Bluetooth' using the search tool located in the taskbar, as shown in the screenshot below. Bluetooth pairing will occur, or the Bluetooth connection will be activated if you’ve previously paired the devices. Once the computer detects the device, it will then automatically proceed to installing the driver, after which the device will be added to the computer's list of devices.A device featuring the BLUETOOTH function is required to conform to the BLUETOOTH standard specified by Bluetooth SIG, Inc. and be authenticated. Even if 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 this unit, the communication environment or the usage environment. Do not place this headset in a place exposed to humidity, dust, soot or steam, or subject to direct sunlight. Do not leave the headset in a car for a long time. It may cause a malfunction. To be able to use the BLUETOOTH function, the BLUETOOTH device to be connected requires the same profile as this unit. Note also that even if the same profile exists, devices may vary in function depending on their specifications. Hold it close to the NFC logo (e.g. left headphone cup on WH-1000XM4). You don't even have to power on your headphones. They will turn on automatically.

However, according to your headphones / speakers setup, you might not hear sound coming from the headphones/ speakersyet. If that's the case, go through the following additional steps below to set them as the default speakers. In this case, delete the pairing information of the headset from the BLUETOOTH device, and then pair them again. NOTE: For how to enter the pairing mode onyour Bluetooth device, refer to the manual supplied with your product. If the life of the built-in rechargeable battery drops significantly, the battery should be replaced. Consult your nearest Sony dealer for replacement of the rechargeable battery. NOTE: If the device name is not displayed in the Bluetooth items, there is a possibility that the Bluetooth function is set to OFF.If you have previously connected the headset to this BLUETOOTH device, only an HFP/HSP BLUETOOTH connection may be made when the headset is turned on. If this happens, use the BLUETOOTH device and make an A2DP BLUETOOTH connection. When you meet a new person, you usually introduce yourself first and exchange basic information. You won’t have to do this again the next time you meet your new acquaintance - unless you forget who they are or vice versa. If the pairing information was deleted by initializing the headset, etc., delete from your iPhone the pairing information for the headset, and then pair them again. Tap on the gear icon next to the device you wish to Disconnect or Remove (forget its pairing information).