Sony MDR-XB950BT Quick Start Manual page 54

headset in a car parked in the sun.
If the computer enters into hibernation mode while connected to the headset, charging will not be completed properly.
Check the setting of the computer before charging. The indicator (red) will go off automatically if the computer enters
into hibernation mode. Charge the headset again in this case.
Use the supplied micro-USB cable only, and connect directly to a computer. Charging will not be completed properly
by an indirect connection, such as via a USB hub.
Hint
You can use the headset by connecting the supplied headphone cable, even while charging the headset.
If charging starts while the headset is turned on, the headset will turn off automatically.
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