128MB, 256MB, 512MB, 1GB, 2GB, 4GB, 8GB Hi-Speed USB 2.0 Certified Compatible With USB 2.0 For Mac and PC, No Driver Req.* No External Power Required Functions as Hard Drive LED Indicates Power, Read/Write Shock Resistance: 1000G Min. Data Retention: 10 Years Required Hard Disk Space: 3M or above Working voltage: 5V Working power: 300mA Static current: 40Ma No driver needed for Windows ME/2000/XP, Mac OS 9.x and above. Supports Windows 98SE (driver required).