The SanDisk Extreme PRO microSDXC UHS-II Card delivers transfer speeds of up to 275Mbps so you can get to your videos faster than ever before. Use the included USB 3.0 reader for convenient transfers and take the bottleneck out of enjoying even your most massive 4K UHD video files2. Finally your memory card can keep up with you and your lifestyle. From a leader in flash memory storage, this card is ideal for offloading 4K UHD video from your action camera, drone, high-performance camera or smartphone.