Product details of Micro Memory SD/TF Card Calss 10 512GB 1. About Capacity: Flash memory vendors are using decimal arithmetic: 1MB = 1000KB,1G = 1000MB calculated, the operating system using binary arithmetic: 1MB = 1024KB,1GB = 1024MB; so there are some differences between display capacity and nominal capacity of flash memory product 2. About Speed: Class10: Read speed around 10-15MB/S ,Write speed around 8.5-11MB/S 3. About Features: (1)High-speed read and write (2)Compliant with the SD Specification Version 2.00 (3)Versatile when combined with the adapter, can be used as a full-size SD card (4)Compatible with microSD host devices; not compatible with standard microSD-enabled device/readers 4. About Specifications: (1)Dimensions 0.43" x 0.59" x 0.039" (11mm x 15mm x 1mm) (2)Operating Temperature -13o F to 185o F (-25o C to 85 o C) (3)Storage Temperature -40o F to 185o F (-40o C to 85o C) (4)Voltage 3.3v 5. Notes: (1) Please check your device prior to purchase to make certain this item is compatible and does not exceed capacity. (2)Depending on your device this may be accurate. On some devices they may perform closer to a class 4-6, which is plenty enough speed for most cell phones, digital cameras, GPS, MP3 players and PDA's.