FEATURES: - Material : Aluminum Case - Suitable for computer & electronic equipment with USB port - Support Windows98SE / ME / 2000 / XP / MAC OS / Linux - Working voltage: 4.5V to 5.5 V - Storing data over 10 years - Memory Size: 128MB-2GB - Plug and play PACKING INFORMATION: - Unit Size : 45?8?mm - Imprint Size: 10?mm - Packing Info:100PCS/CTN,27.5?1.5?0,1.2KGS