Apple iMac (21.5-inch and 27-inch, Mid 2010) - Manual (Page 23)

23 Chapter 2 Life with Your iMac
Power port
Connect the power cord to your iMac.
Security slot
Attach a lock and cable to discourage theft (available separately).
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Power button
Press to turn on your iMac or put it to sleep. Hold down to restart your iMac during
troubleshooting.
Memory access
Your iMac comes with at least 4 GB of memory installed as two 2 GB memory modules.
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AirPort Extreme wireless technology (inside)
Connect to a wireless network using built-in AirPort Extreme technology.
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Bluetooth ® 2.1+EDR wireless technology (inside)
Connect wireless devices, such as the Apple Wireless Keyboard and Apple Magic Mouse,
Bluetooth mobile phones, PDAs, and printers.