Features: top Notch security: galvanized steel cable protects your laptop from theft simple setup: just insert the cable end into your USB 3.0 port on your MacBook Air or MacBook Pro; unlocks with an included key elegant design: minimal, space-saving design keeps your workspace uncluttered master key compatible only with USB 3.0 ports on MacBook Air and MacBook Pro. Not compatible with PC laptops or other generations of USB. Check your MacBook Specifications for compatibility. * CTA Digital's security products are designed to protect your device from theft. Products are made with high-quality materials, like reinforced heavy aluminum slots, steel cables, and secure lock-and-key systems. Where CTA Digital makes every effort to protect against destruction of or loss of property. and cannot be responsible for any event that leads to the damage or theft of a device.