Sony PCG-K415B User Manual page 40

Before you use the mouse
Before attempting to use the wireless mouse, you must enable communication between the computer and the mouse.
Two AA batteries, specific for use in the wireless mouse, are supplied with your computer. They are identified by a sticker "For mouse"
on the packaging.
To connect the wireless mouse, proceed as follows:
1 Insert the two specific AA batteries into the wireless mouse as shown.
2 Turn on the computer.
3 Press the CONNECT button (1) on the computer.
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Using your VAIO computer