The ExpressCard 34 Multi-Card adapter enables the fastest data transfer from 24 types of memory cards - including Secure Digital, SDHC, MMC, Memory Stick, Memory Stick PRO & xD - to the new Apple MacBook Pro and PC laptops with an ExpressCard slot.* It works in both the 54 mm and 34 mm ExpressCard slots and can transfer your data up to 20 MB per second. Its small compact size makes it the perfect tool for photographers on the go. ATTENTION: This current model does not work with Sony EX1, XDCAM EX, or similar models that require SxS or ExpressCard SSD memory. *Some cards require adapters