Apogee Symphony I/O Mk II TB Card
The Symphony I/O Mk II has one Thunderbolt Card slot & one Option Card slot. A Symphony I/O Mk II can be configured with just the Thunderbolt Card, just an Option Card, or both.
The Thunderbolt Card enables connectivity to a Thunderbolt-equipped Mac. This card is required for the unit to operate with the Symphony Control Software as well as with the optional Control hardware remote.
Two Thunderbolt 2 ports are provided. They can be used for connecting to a second Symphony I/O Mk II or to attach additional Thunderbolt peripherals such as a hard drive or external display to your Mac system.