Add 2 gigabit ethernet ports to your laptop through a single expresscard slotr r provides two independent 101001000 mbps ethernet interfaces from a single expresscard slotr use less system resources with built in ndis5 checksum and large send offload support and jumbo framesr backed by a startechcom lifetime warranty and free lifetime technical supportr r add 2 gigabit ethernet ports to your laptop through a single expresscard slot the ec2000s 2 port gigabit expresscard ethernet adapter