Sonnet Technologies - Sonnet Presto Gigabit Ethernet Pro ExpressCard/34 Provides Gigabit Ethernet Connectivity to Mac and PC notebooks with ExpressCard slots-Simple way to add or expand Gigabit Ethernet connectivity to any compatible computer Simple Connection-Supports gigabit speeds on common CAT-5 cabling (no need for costly cable replacement) Link Aggregation Support-Supports link aggregation with onboard Gigabit Ethernet portsThunderbolt-compatible Thunderbolt-compatible-Compatible with Sonnet's Echo ExpressCard Pro Thunderbolt Adapter & SxS Media Reader Supports link aggregation with onboard Gigabit Ethernet ports