The RocketStor 6661B allows you to quickly add any PCIe x4, x8 or x16 card to your Thunderbolt™ 3 capable computing platform; such as media capture, Ethernet, Fibre Channel, or external Storage/RAID controller cards. Like its predecessor, the lightweight small foot-print design is ideal for compact workstations and mobile computing platforms such as iMacs, MacBook Pros and Razor notebooks. At just 7 inches tall, and less than 3 inches wide, the RocketStor 6661B is small enough to pack into a laptop bag, yet is capable of supporting a full-height, full-length, single width PCIe card.