SanDisk Phone microSDXC UHS-I memory card expands mobile storage and helps keep apps, photos, and videos accessible without slowing device performance. Designed for everyday mobile use, it delivers fast read speeds up to 200 MB/s and app-optimized performance to support responsive app loading and smoother multitasking. With 128 GB capacity and 4K UHD support, the card provides ample space for high-resolution photos and video while meeting common speed class requirements for reliable recording and playback. The durable design tolerates normal operating temperatures from 0°C to 45°C to suit typical mobile environments.