SanDisk Extreme microSDXC UHS-I Card 64GB Overview The SanDisk Extreme 64GB microSDXC UHS-I card is a compact high-speed storage option built for phones, action cameras, drones, and Full HD or 4K media capture. Key Features 64GB capacity Read speeds up to 170MB/s Write speeds up to 80MB/s UHS-I interface Lifetime limi..