iMac Intel 21.5" EMC 2428 (Mid 2011) Adapters
Parts that work with iMac Intel 21.5" EMC 2428 (Mid 2011):
Apple USB Ethernet Adapter
Allows you to connect to the internet with an Ethernet cable via USB. Model A1277.
In May 2011, Apple upgraded the 21.5" iMac. Externally, the machine features edge-to-edge glass and an aluminum rear bezel. Internally, an LED display, 4 RAM slots (to upgrade to a maximum of 16 GB RAM), more powerful video processing, and featuring quad Core i5 and i7 processors.