Sony PCV-RZ49 Quick Start Manual page 31

To set up the remote control
Insert two AA batteries (supplied) into the remote control as shown.
Inserting batteries into the remote control
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If your remote control does not operate properly, you may need to replace the
batteries. If your remote control is not being used for extended periods of time,
remove the batteries to avoid possible damage from battery leakage.
About the Remote Control
31