The Wireless Lock and Key for Computers is a Bluetooth-enabled key fob that automatically blocks access to your computer when you walk away to prevent others from seeing your sensitive information. It provides 2-factor authentication to log back on. Or, enable the auto-unlock feature and it unlocks when you come back into a 30-ft. range. It's military grade AES-256 encryption, compatible with Mac OS X and Windows 7, 8, 8.1 and 10.