This Hi-speed Quad 4Port) USB 2.0 Express Card Adapter gives you 4 additional USB 2.0 ports on any laptop with an Express Cardbus slot. The card simply slides into the Cardbus slot and away you go. Its manufactured by Apiotek and built around the latest and highly regarded NEC Chipset 720114. Suitable for Windows 7.

What are they and why are there two sizes???
Guide to choosing the right Express Card (34mm or 54mm)

Features:

• Compliant with new Express Card 34/54 interface
• Supports Quad USB2.0 with 480 Mbps
• Supports XP, VISTA, Windows 7 & Mac
• Supports Plug & Play
• No driver required

Specification:

• APIOTEK Speed Quad USB 2.0 Express Card Adapter
• Operation Voltage - +3.3V ~+3.0V (+/-5% wide range power supply)
• Interface - Express Card 34 / USB 2.0
• System Environment:
• Operating Temperature: 0°C ~50°C
• Operating Humidity: 10% ~90%RH
• System Requirements - Win2000, ME, XP & VISTA or Mac 8.6, 9.x, 10.1.2, and above
• Manufacturer: Apiotek, Taiwan