microSDXC Class 10 UHS-I 300x (Premium) Combining next-generation Ultra High Speed Class 1 technology with extra large capacity, Transcend microSDXC UHS-I memory cards not only provide the best possible performance during a host of mobile activities but also enough storage space to carry an entire collection of personal media files. - Supports Ultra High Speed Class 1 specification (U1) - Smooth Full HD video recording performance - Ideal upgrade for smartphones, tablets, and digital cameras - Class 10 compliant - Built-in Error Correcting Code (ECC) to detect and correct transfer errors - Exclusive RecoveRx photo recovery software