DK42PHU−3 is a dual head, 4−source, 4K30 UHD, HDMI, secure KVM switch. It enables users to securely share peripherals − keyboard, video, mouse, audio, and USB − between four networks/computers. It also enables assigning a USB port to a specific computer while switching other peripherals, such as when a USB smart card reader must remain mapped to a certain computer.

• Interact with four isolated computers using a single set of keyboard, video, mouse, audio and USB peripherals.
• Freeze USB — Assign the USB port to a specific computer while switching the keyboard, video, mouse and audio between other computers. Useful for various scenarios, for instance, when a USB smart card reader must remain mapped to a certain computer.
• Smooth and Intuitive Switching — Virtual Display Technology enables you to automatically switch control from one computer to another by dragging the cursor over the computer’s display border. Peripherals switch to the next computer without pressing any buttons.
• 4K Video Quality — Run graphic–intensive, ultrahigh definition applications on all single and dual monitor KVM models.
• Avoid Typing Mistakes — Since two–way communication is blocked by the KVM security, keyboard lock LEDs do not function. This helps users avoid typing mistakes by visually indicating the status of keyboard locks (CAPS–LOCK | NUM LOCK | SCROLL LOCK) on the product’s front facing panel.
• Keep Up with Future Requirements Through Interchangeable KVM / KM Functionality — Adjust with versatile setup scenarios. The device can be configured in two modes, KVM and KM. In KVM mode (default) one display, keyboard and mouse set is shared between all computers. In KM mode each computer is connected to a separate display while keyboard and mouse are shared, thus allowing simultaneous work on multiple computers.