How do I change the batteries in the remote control?
Open the battery compartment on the back-bottom of the remote control by sliding the battery door in the direction shown by the arrow. Replace the old batteries with 2 type AAA-1.5V batteries, making sure the + and - ends are aligned correctly. Reposition the battery door and slide it back until it clicks. Remove the batteries if you won't be using the remote for a long time.
From the official Sony Sync Headphones manual, page 5
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