Apple LED Cinema Display (27-inch) - Manual (Page 12)

12 English
Using the USB Ports and Security Slot
Your Apple LED Cinema Display has three powered USB ports on the back. Use these
ports to connect a mouse, keyboard, iPhone, iPod, or other USB peripheral.
Important: You can use these USB ports to charge your iPhone or iPod, even when
your display isn’t connected to a computer. If you use one of these ports to sync
information between your computer and an iPhone or iPod, make sure the display’s
USB cable is connected to your computer.
Security slot
USB ports
To secure your display, attach a locking cable to the security slot.