The Sescom Balanced Audio Professional Grade XLR A/B Passive Switch is designed to convert and switch between 2 inputs to 1 common output. It uses high quality locking XLR connectors and functions as an input and output expander. The full duplex switch does not require power for operation and is used to avoid wear and tear of connectors via constant plugging and unplugging. It is ideal for home theaters, studios, or devices that normally require plugging / unplugging.