Thunderbolt Audio Option card designed for Apollo Duo and Apollo Quad devices. It increases the number of simultaneous use of UAD plug-ins, increases performance at higher sample rates, and reduces plug-in latency versus FireWire technology. It has two Thunderbolt ports that allow serial connection for other devices and built-in FireWire Apollo ports, that can be used as FireWire 800 Hub via Thunderbolt. It requires an Apollo or Apollo 16 audio interface for proper operation. It features easy installation, with the supplied accessories and instructions. Thunderbolt cable is not included. Compatibility with OS: Mac OS X 10.8.5 Mountain Lion, 10.9 Mavericks, or 10.10 Yosemite