256 GB (MLC chips)Storage expansion card for MacBook.Operating Voltage 2.7V~3.6V,Operating Temperature -25°C (-13°F) ~ 85°C (185°F)Max Read: 95MB/s, Max Write: 55 MB/sFor MacBook Pro with Retina display 13" (Late 2012 - Early 2015). Specifically designed to fit neatly into the card slot of the MacBook ProFree download of Recover softwareCompatibility with Mac OS X 10.11 El Capitan is currently under verification