Apple iMac (21.5-inch and 27-inch, Mid 2011) - Manual (Page 25)

25 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
Install additional memory. Your iMac comes with at least 4 GB of memory installed as
two 2 GB memory modules.
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802.11n Wi-Fi (inside)
Connect to a wireless network using built-in 802.11n Wi-Fi technology.
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Bluetooth® wireless technology (inside)
Connect wireless devices, such as the Apple Wireless Keyboard and Apple Magic Mouse,
Bluetooth mobile phones, PDAs, and printers.