description Specification: 1. USB connection, support Hot plug & Play. 2. No external power supply requird. 3. Support different types of os. 4. Solid State Storage, Shock proof and electromagnetic proof. 5. Write/delect protection switch 6. Durable data storage 7. Fast speed in write/read transfer 8. Hardware Requirement: PC with USB connection, Notebook. 9. Life:>1 million times 10.capacity: 64GB/128GB/256GB. Read Rate: 12Mb-18Mb/S Write Rate: 6-8 Mb/S Interface USB 3.0 Excellent USB Memory stick in excellent condition? Capacity: 64GB=approximately 62GB-64GB（between) 128GB=approximately124GB-128GB（between) 256GB=approximately 250GB-256GB（between) Note: Vendors are using Flash memory decimal arithmetic: 1 MB = 1000KB, 1G = 1000 MB; Calculated, operating system with binary arithmetic: 1 MB = 1024KB, 1 GB = 1024 MB; So there are some differences between display capacity and nominal capacity of flash memory products Package Included: 1x Flash Memory Stick Shipping Detail: We shipped within 24- 48 hours. Dear customer, hello, if you are satisfied with the product, please help give five-star praise, thank you very much.