The OWC Envoy Pro EX is billed as a portable SSD that is ideal for several different use cases. The Envoy is actually actually sold bare, as well as populated with an M.2 SSD, making it portable and ready for external use. This particular version of the OWC Envoy Pro EX is the USB 3.1 Gen2 model, though the product comes in Thunderbolt 3 flavor as well for those that want the native NVMe performance experience.