Onten Otn-UCA325 M.2 NVMe SSD Enclosure The Onten OTN-UCA325 is a high-performance external enclosure designed to convert internal M.2 SSDs into portable USB-C storage, notably supporting speeds up to 20Gbps via a USB 3.2 Gen 2×2 interface. It features a tool-free design and a durable aluminum build for optimal heat dissipation during intensive tasks.