The Transcend 300S is a 256GB microSDXC card designed to handle demanding storage tasks, from capturing 4K Ultra HD video and raw photos to managing large app libraries. It utilizes a UHS-I interface with a U3 and V30 speed rating, ensuring a minimum sequential write speed of 30 MB/s to prevent frame drops during high-resolution recording. You can expect read speeds reaching up to 100 MB/s and write speeds up to 40 MB/s, while the A1 application performance class makes it responsive when running apps directly from the card. Built to withstand harsh environments, this card is waterproof according to JIS IPX7 standards, meaning it can survive immersion in water up to 3.3 feet for 30 minutes. It also resists extreme temperatures ranging from -25 to 85°C, as well as shocks, X-rays, and static electricity, which protects your data during travel or outdoor use. The package includes a microSD to SD adapter for easier use across different devices, and you can use RecoveRx software if you ever need to retrieve lost files.