TOPMORE 128GB microSD Class 10, High Speed UHS-1 U3 for 4K Video Recording, microSDXC Memory Card with Adapter TOPMORE 128GB microSDXC UHS-I Class 10 (U3 for 4K video recording) Flash Memory Card. Read speed is 90MB/s at maximum, write speed is 50MB/s. Class 10 (U3 for 4K video recording) high speed, smooth performance in continuous shooting and recording mode. Shockproof, shatterproof, waterproof, and dustproof. It can endure temperature difference. Lifetime warranty. Package includes SD adapter.