Kensington USB Port Lock with Cable Guard, Square, K67720US Physically protects valuable data without the complication, installation, maintenance, and upgrade costs of software Just plug into the USB port and push the button to lock. No technical experience necessary. One USB Cable Guard captures and locks in a USB Cable (for a keyboard or mouse) in a port adjacent to a USB Port Lock A USB Port Block used with a single USB Port Lock prevents access to adjacent ports with either vertical or horizontal orientation Stop thieves before the start with a visible sign that youre being protected