The Ins and Outs of Your iMac's Target Display Mode
USB-C and Thunderbolt: Understanding Ports and Cables for Macs and iPads - The Mac Security Blog
USB 3.0 for iMac mid 2011 | MacRumors Forums
Identify your iMac model - Apple Support
Which Macs have Thunderbolt Ports? - Transcend | Especialista en productos de almacenamiento y multimedia
21.5- and 27-inch iMacs (Mid 2011) | Macworld
USB 3.0 for iMac mid 2011 | MacRumors Forums
Adding USB3.0 to late 2009 iMac (11,1) | MacRumors Forums
Identify the ports on your Mac - Apple Support
4-Port USB 3.0 Hub For iMac - Sabrent
Apple iMac 21.5-inch 2.5GHz Quad-core i5 (Mid 2011) MC309LL/A 3 | mac of all trades
Supercharge Yourself with the New Thunderbolt-Equipped Quad-Core iMac | B&H eXplora
Amazon.com: Mini DisplayPort to HDMI Adapter for iMac Mid 2011(27-inch, 21.5 inches) Mini DP to HDMI Adapter Compatible with MacBook Air/Pro, Microsoft Surface Pro/Dock, Projector and More 1-Pack : Electronics