Once you have installed the key in your USB drive, you just have to extract the device, and in a couple seconds, your PC will be completely blocked. To unlock it again, you just have to plug the USB drive back in.
In the program settings, you can configure many options like detection frequency, desktop elements to hide, or notification sounds. As a security measure, in case you lose the USB drive, you can set up a password to unlock the system.
Free for personal use