Extreme speeds for fast data transfers, app performance and 4K UHD. Ideal for your Android smartphone, action cameras or drones, this high-performance microSD memory card lets you capture 4K UHD video, Full HD video and high-resolution photos. The super fast SanDisk Extreme PRO microSDXC UHS-I memory card reads up to 170MB/sec and writes up to 90MB/sec. And it's A2 rated, so you get fast app performance for a great smartphone experience.