Transcend's Class 4 micro SDHC cards have a minimum write speed of 4 MB/s and are an economical choice for saving a larger number of files.All microSDHC cards have passed the compatibility and reliability tests. Each card is equipped with an integrated ECC (Error Correction Code) error correction which automatically detects and removes errors during data transmission. You can use a wear-levelling algorithm for a long life span. Compatible with SD 2.0 standard Class 4 Classification guarantee reliable writing Corresponds to the requirements of the most mobile devices such as digital cameras, cell phones and eBook readers Built-in Error Correction Code (ECC) error correction for the identification and elimination of transmission errors Specifications : Memory capacity 8 GB Speed class Class 4 Reading 4 MBps Writing 4 MBps Product type microSDHC card