2 (20Gbps) external SSD with NVMe internals. The SSD inside uses a Phison P27T controller, which means it's DRAM-less PCIe 4.0
it uses your device memory for primary caching duties. The NAND is 162-layer TLC, and of a modern variety according the test results.
The article from PCWorld reviews the Addlink P21 USB SSD, highlighting its performance, design, and value. The Addlink P21 is a portable SSD that connects via USB 3.2 Gen 2, offering read speeds up to 1050 MB/s and write speeds up to 1000 MB/s, making it one of the fastest USB SSDs available at the time of the review. It features a sleek, durable aluminum casing which also serves as a heatsink to manage thermal performance. The drive's compact size and lightweight design make it highly portable. The review praises its speed, which rivals that of internal NVMe SSDs, and its competitive pricing, positioning it as an excellent choice for users needing fast, portable storage. However, it notes that while the drive performs exceptionally well, its real-world application might not always justify the speed for everyday tasks, but for professionals or enthusiasts requiring high-speed data transfer, it's a top contender.