This AirPort wireless network card provides 802.11a/b/g/n WiFi functionality. Later 2012+ releases use a single card for WiFi and Bluetooth, but this iMac uses this card for WiFi and a separate, dedicated Bluetooth card.
607-7211 661-5979 Card, AirPort - 27 inch Mid 2011 - A1312 iMac NB-2936W This is a replacement airport wireless card for the 21.5-inch and 27" iMac released in Mid 2011. EEE code: DDV3