About the deficiencies: 1) You won't be able to connect the wire to a dead battery and keep listening over the wire, and 2) You won't be able to charge the battery and listen at the same time if you try to connect the wire to a live battery. Either you charge the batteries or you listen to music while they are in use. 2) The headphones will immediately connect to the device with which they have been linked as soon as the power is switched on. In the event that the VT of this device is not accessible, you will need to switch to the search mode in order to find a new pairing. Therefore, in order to connect the headphones to another device, you must first locate the device to which they are currently connected and turn off pairing or BT on that device. Only then will you be able to connect the headphones to another device. In the event that you are unable to locate it, you will need to go for a walk in order to severe this connection. A true story: there were many people over, and one of the children accidentally linked their headphones to another person's phone. It was late, and everyone, with the exception of me, went to bed. For the headphones to work with my phone, I needed to get some fresh air, so I went for a stroll.
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