It offers simultaneous bi-directional 10Gbps transfer speeds over a single cable, with the flexibility to daisy-chain up to six Thunderbolt-ready devices with a single connection as well as offering full display port support for a 7th Thunderboltor display port equipped monitor.
The Sonnet adapter connects directly to a computer, or at the end of a Thunderbolt device chain with a Thunderbolt cable (available at the Apple Store).