SEJM Micro SD TF to SD Card Mini Adaptor for Extra Storage Apple MacBook Air 13", Pro 13", Pro 15", Pro 17", Pro Retina 15" 2011 and 2012 Product Description Features: Turns Micro SD card to SD card Conveniently expand the storage space for MacBook using sd card Supports an Micro SD / SDHC. Can also be used as a dustproof plug Compact size for ease of use Designed for MacBook Read/Write Speed: Depends on your MicroSD Card used Main product dimensions: 25x23x2mm (L x W x D) Supported Models: Macbook Air 13" Macbook Pro 13" Macbook Pro 15" Macbook Pro 17" Macbook Pro Retina 15" 2011 and 2012 Note: This adapter is NOT for 13" Retina model and MacBook 15 inch retina 2013 onwards, for that models you need a different adapter