Description: Interface: USB 2.0Writing Speed: 6M/SReading Speed: 15M/SCapacity: 4GB,8GB,16GBRing inner diameter: 25mmTotal Size: Approx.55x30x30mmFast data transfer rate--Read(): 12MB/sec Write(): 5MB/sec. Features: 100% and high quality.Hot plug playCompatible with USB 1.1/2.0Compatible with PC, Notebook, MACStore your pictures, videos, and songs and any kind of data.Easy to carry and not easy to lose for its innovative shapeSupport Windows 7 / 8,Windows Vista,Windows 2000, OS X, Linux.Small style and fashionable products, as an impressive gift for your beloved, friends or even customers. Package Included: a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a