Pretec 4GB i-Disk SECURE High Speed Rugged USB Flash Drive (Waterproof, Shock Proof) Enhanced for Windows ReadyBoost Function Resistant from water , fire , and any heavy impact Totem pattern on the metal housing Capacity : 128MB - 8GB , Compliant USB2.0/1.1 Special software : mobile lock and secret zip ( windows only ) O/S Support : Windows ME / 2000 / XP / Vista ; Mac 10.x ; Linux 2.4 and above