What should I do if my TV remote control is not responding to button presses?
The batteries in the remote control might be empty. To replace them, slide the battery door on the back-bottom of the remote control and insert 2 new AAA-1.5V batteries, making sure the + and - ends line up correctly. If the TV still doesn't respond, the batteries may need replacement.
From the official Sony Wireless Headphones manual, page 5
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