Presto Gigabit Ethernet Pro Expresscard 34 1PORT Re Osx 10.5+ Simple way to add or expand Gigabit Ethernet connectivity to any compatible computer Supports gigabit speeds on common CAT-5 cabling-no need for costly cable replacement Supports link aggregation with onboard Gigabit Ethernet port Full/half duplex 1000/100/10BaseT auto-negotiation Plug and play installation in MacBook Pro