1600MHz (PC3 12800) 204-pin CL11 SODIMM for laptop memory ^^ Runs at low voltage of 1.35V that enables to effectively decrease hardware power consumption. ^^ Compatible with MacBook Pro13-inch/15-inch Mid 2012, iMac 21.5 -inch Late 2012/ Early/Late 2013 ^^ Backed by a lifetime warranty to promise complete services and technical support.