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The Echo Express III-D Desktop Thunderbolt 2 Expansion Chassis from Sonnet enables you to connect three compatible full-size professional video capture, audio interface and other special-purpose cards to your iMac, Mac mini, MacBook Air, MacBook Pro or the new Mac Pro with a Thunderbolt port. The Echo Express III-D integrates a universal 300W power supply and includes a 75W auxiliary power connector for cards that require supplementary power. The expansion chassis is eco-friendly as it automatically powers off when the connected computer is powered off or in sleep mode. The use of larger, slower-spinning fans in the Echo Express III-D reduces noise. Two Thunderbolt 2 ports support daisy chaining of up to six devices to a single port on your computer.