KVM switches are hardware devices that allow IT personnel to use a single keyboard, video monitor, and mouse (KVM) to control more than one computer at a time. They reduce the number of peripherals that data centers and server farms require, enabling businesses to conserve space, cut power consumption, simplify cabling, and reduce expenses. Most KVM switches are metal enclosures with a plastic faceplate and light emitting diode (LED) indicators. Buttons on the front of the device control switching among computers. Ports on the back are used to connect peripherals and client devices. Scalable, 8-port and 16-port expanders that provide cross-platform support allow IT personnel to increase the number of computers that can be managed from a single switch.  Some KVM switches are used in on-site applications to manage Ethernet-based local area networks (LANs). Others are used in enterprise-level applications that permit remote monitoring and support transmission control protocol/ Internet protocol (TCP/IP) or wireless fidelity (Wi-Fi) communications.