Delivers the speed and capacity you need to capture 4K Ultra HD video Up to 40MB/s write speeds for faster shot to shot performance and up to 90MB/s for faster transfer Highest SD card format video recording performance with both Class 10 and UHS Speed Class 3 (U3) ratings for capturing Full HD and 4K Ultra HD (3840 x2160p) video Built for and tested in harsh conditions; temperature proof, water proof, shock proof, and x-ray proof.