The SanDisk microSD Express card (MPN SDSQXFN-256G-GN4NN) adds 256GB of removable microSDXC storage to compatible devices with a microSDXC slot, including smartphones, tablets, action cameras, drones, handheld gaming devices and laptops.
Its PCIe Gen 3 NVMe interface supports sequential read speeds up to 880MB/s and write speeds up to 650MB/s. These are maximum listed speeds; actual performance depends on the host device and interface.
The card works in microSD Express, UHS-I and UHS-II slots. In UHS-I and UHS-II devices it operates at UHS-I speeds, so check the slot type when choosing it to expand storage in a portable gaming system or camera.