The Kramer K244E 20-0001290 is a secure 4−port, DVI−I dual−display KVM switch. It provides the highest possible isolation between four connected computers each having two video output ports. The video ports support various video interfaces, from VGA to dual−link DVI and HDMI. Each computer may connect to up to two independent displays and operate in dual−display mode. For enhanced security, a USB user authentication port (DPP) connects to a smart card or biometric reader. This requires the insertion of a physical authentication card or identification of a fingerprint to access the various computers/networks.