Description Brand: PNY tf card Micro memory cards are backward compatible with any electronic devices that are enabled. Included adapter grant access to memory card on every computer with memory card reader. Compatible with all devices which have micro memory card slot Expand the memory capacity of your cell phones, cameras, GPS, MP3 players etc. Combining with a sd adapter, it can be used as a standard sd card 15Mb/s read and 10Mb/s write speed Available in 128MB/1GB/32GB/64GB/128GB/256GB/512GB capacities Water-proof, temperature proof, X-ray proof, shock proof± Up to 30MB/sec read speed; write speed lower. Based on internal testing; performance may be lower depending upon host device. 1 megabyte (MB) = 1 million bytes. 1 gigabyte (GB) = 1 billion bytes. Some capacity not available for data storage. About capacity display in computer : 1GB=975MB 32GB=approximately 31GB-32GB 64GB=approximately 62GB-64GB 128GB=approximately 123GB-128GB 256GB=approximately 249GB-256GB 512GB=approximately 499GB-512GB Dear customer, hello, if you are satisfied with the product, please give me five stars, thank you very much.