The Thunderbolt 3 Option Card for rackmount Apollo audio interfaces allows music and audio producers to connect their Apollo directly to compatible Mac or Windows systems using Thunderbolt 3. This user-installable card offers two Thunderbolt 3 ports, and provides 15W bus power to all downstream Thunderbolt 3 peripherals — perfect for daisy-chaining additional Apollo interfaces and UAD-2 Satellite DSP Accelerators, modern storage solutions, 4K displays, and more. Now You Can: Add the latest generation Thunderbolt 3 connectivity to your rackmount Apollo interface Get two Thunderbolt 3 ports for daisy-chaining Apollos or other peripherals Supply 40 Gbps bandwidth for peripherals including 4K displays and hard drives Provide 15W bus power to downstream Thunderbolt devices