iStorage IS-FL-DA-256-4 4GB datAshur 256-bit USB encrypted flash drive PIN authenticated 7-15 digits - Alphanumeric keypad use a memorable number or word for your PIN Military grade AES-CBC 256-bit full disk hardware encryption No software or drivers required - OS & platform independent - compatible with Windows, Mac, Linux and Embedded Systems Dust and water resistant durable aluminium housing - Tamper evident and resistant Auto-lock on removal. Verified as Citrix Ready