Sescom SES-XLR-AB-FS Balanced XLR A/B Passive Foot Switch with Disconnect/Mute Designed to convert and switch between two inputs to one common output with high quality locking XLR connectors Switch requires no power and is full duplex / bidirectional Excellent for use in Studios for, but not limited to, PA or talkback switching and as it features hands-free switching by a foot press so it can be placed under the desk for workflow facilitation!