34mm Express Card to 16bit PCMCIA 32bit Card Bus Adapter 34mm or 54mm ExpressCard slot supports supports ExpressCard ver 1.1 and 2.0 supports 16bit PCMICA 5V power and 32bit CardBus 5V and 3.3V power does not support PCMCIA 12V power Supports P2 Card with Windows XP, Vista, and Windows 7 does not support MAC OS Supports 3G/3.5G CardBus