Hyundai 64GB microSDXC UHS-I Memory Card with Adapter, 90MB/s (U3) 4K Video, Ultra HD, A1, V30 (SDC64GU3) - Up to 35MB/s write speeds for fast shooting. 4K UHD and Full HD ready with UHS Speed Class 3 (U3) and Video Speed Class 30 (V30). Rated A1 for faster loading and in app performance. Compatible with Smartphones, Android Tablets, Tablet PCs, and more. Built for and tested in harsh conditions: Temperature Proof, Water Proof, Shock Proof and X-Ray Proof: