Apple iMac (21.5-inch and 27-inch, Mid 2011) - Manual (Page 33)

33 Chapter 2 Life with Your iMac
Pairing Your Apple Remote
Pair your Apple Remote with your iMac or another Apple product. After you pair the
iMac or Apple product, it’s controlled by only the paired remote.
To pair your remote:
1 Move within 3 to 4 inches (8 to 10 cm) of your iMac or Apple product.
2 Point the remote at the IR receiver on the front of your iMac or Apple product.
3 Hold down Right and Menu for 5 seconds.
When you’ve paired your remote, a chainlink symbol appears onscreen.
To unpair your remote on an iMac:
1 Choose Apple () > System Preferences from the menu bar.
2 Click Security, and then click Unpair.
For Apple TV or other Apple products, hold down Menu and Left to unpair.
Replacing the Battery
To replace the battery:
1 Use a coin to remove the battery cover.
Battery
compartment
2 Insert a CR2032 battery, positive (+) side up.
3 Replace the cover and use a coin to tighten it.