Thunder2 10G Network Adapter (T2NA-TLITS-AKT) Thunderbolt 2 for lighting fast transfer speeds of up to 20Gbps Large gaps for air flow and heatsink for passive cooling Captive Thunderbolt cable and cable holder Bus powered 10GbE network adapter Jumbo frame support (16K) Thunderbolt 2 for lighting fast transfer speeds of up to 20Gbps Large gaps for air flow and heatsink for passive cooling Captive Thunderbolt cable and cable holder Bus powered 10GbE network adapter Jumbo frame support (16K) Durable, compact and portable Protective rubber sleeve