How do I lock a TV channel to prevent children from watching it?
Press Quick settings > Navigation keys up > Channel > Parental Controls and press OK. Enter your PIN code if necessary, select Channel Blocked and press OK. Press Navigation keys up or down to select the channel you want to lock or unlock, and press OK. A locked channel will be marked with a lock icon and requires the PIN code to view.
From the official Sony Sync Headphones manual, page 9
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