iMac Intel 21.5" and 27" (Mid 2011) SSD Upgrade Bundle - iFixit Store
In-Line Digital Thermal Sensor HDD Upgrade Cable for iMac 2011, (DIDIMACHDD11), Includes cables necessary for drive installation into main drive bay of Apple.., By OWC - Walmart.com
OWC Data Doubler Optical Bay Hard Drive/SSD OWCDIDIMCL0GB B&H
OWC Internal SSD DIY Kit for Apple iMac 27" OWCDIDIM27SSD11 B&H
How to Install a 2.5-inch SSD in the SSD Drive Bay of a 27-inch iMac Mid 2011 (Updated) - YouTube
That's not a defibrillator, it's OWC's DIY SSD kit for 2011 iMacs - 9to5Mac