... 128MB,256MB, 512MB, 1G, 2G, 4G 2) Both USB 1.1 and 2.0 available Production Description of USB bracelet : (1) Material :100% silicon ... rubber ,harmless for body ,Green material(2) Bracelet size : ... Capacity: 256, 512MB, 1G, 2G, 4G(5) Both USB 1.1 and 2.0 available(6) Driverless installation in Windows 98, 2000, XP ...