1. USB connection,support Hot plug & Play.

2. No external power supply .

3. Support different types of os.

4. Solid State Storage, Shock proof and electromagnetic proof.

5. Durable data storage.

6. Fast speed in write/read transfer.

7. Hardware Requirement: PC with USB connection,Notebook,MAC8.Capacity:128MB/4GB/8GB/16GB/32GB/64GB

About real capacity

128MB = approximately 110MB-120MB

4GB = approximately 3.6GB-3.9GB

8GB = approximately 7.4GB-7.8GB

16GB = approximately 14.2GB-15GB

32GB = approximately 28GB-30GB

64GB = approximately 58GB-60GB

This is calculation difference between manufacturer and your PC, please Google 'Memory card capacity' to get more information.Your PC says 1GB = 1.073741824 Billion bytes where Market Defines 1 GB = 1.00 Billion bytes.The pursuit of the perfect person is not recommended to buy.