With SanDisk QuickFlow technology (64GB - 1TB) this card optimizes performance for time-saving media transfers with high reading speeds up to 190MB/s. For maximum speeds, use with a SanDisk Professional PRO-READER SD and microSD (sold separately). Capture fast photos or record 4K UHD video at up to 130MB/s write speed. The SanDisk Extreme microSDXC UHS-I card allows you to take photos faster, perfect for recording outdoor adventures, weekend trips, or sporting events without skipping frames. With up to 1 TB, the SanDisk Extreme microSD UHS-I allows you to record uninterrupted 4K UHD and Full HD video with UHS Speed Class 3 (U3) and Video Speed Class 30 (V30). Get faster app performance for a unique smartphone experience with the SanDisk Extreme microSD A2 specifications. SanDisk Extreme microSDHC and microSDXC UHS-I cards are shockproof, temperature-resistant, waterproof, and X-ray proof, so you can enjoy adventures without worrying about the durability of your memory card.