Important information To report an issue with this product click here. Product Description Package Include: 1* 512GB Micro SD memory Card with Adapter 1* 1024GB Micro SD memory Card with Adapter About capacity: Computers are binary and other devices are decimal. Therefore all TF cards may show a few GB less on the device which is completely normal 512GB=approximately 457GB-479GB 1024GB=approximately 935GB-958GB Please Note:(① The speed of the memory card is greatly affected by the card reader adapter USB port etc.Please do not use cheap card readers to test the memory card low-quality card readers will reduce the memory card speed. ②Please set the storage path before use otherwise the files may be stored in other places instead of the memory card ③Up to 20MB/s read speed; write speed is lower. According to internal testing; depending on the host device interface usage conditions and other factors performance may be reduced. 1MB = 1 000 000 bytes ④ Our Store offers genuine memory card. Please feel free to contact us if you any issue about the flash memory CARD and our service. Backed by 30-day refund and 12 months warranty.Thank you for your coming !