Apple remote control useful to control multimedia on your mac. You can buy it or if you own Apple TV you already have it and can be used even more. Here is quick tutorial guide you how to pair apple remote control in Mac OS X Yosemite.
Step 1. Open System Preferences
Step 2. Go to Security & Privacy
Step 3. Click the lock to make changes. Type admin password.
Step 4. Go to Advanced button in the lower-right corner.
Step 5. Go to Pair button
Step 6. To pair your remote with your mac press and hold Menu and Next buttons until paired-remote graphic appears on screen.
Now your Apple remote controller is connected with your mac.