Kensington Personal Firewall, USB Security Key, Mobile Security for Windows Notebooks Mobile security made easy with USB key-based plug and play firewall - plug in to activate, remove to disable Detects and protects against hackers in all wireless environments--even outside corporate firewalls. Protection will not interfere with corporate firewall and anti-virus software Hides your identity from the Internet and safeguards important data stored on your notebook For PC compatible notebook computers running Windows XP (R)