What should I do if the remote control is not responding?
If the TV does not react to key presses on the remote control, the batteries might be empty and need replacement. Open the battery compartment on the back-bottom of the remote control, replace with 2 AAA-1.5V batteries ensuring correct polarity, and reposition the battery door until it clicks. (Page 5)
From the official Sony WH-1000XM4 Wireless Noise-Canceling Headphones manual, page 5
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