The WB-100 is cardioid condenser wired boundary microphone with ultra-quiet electronic switch can be set to any of four operating modes such as touch - mute, touch - on, touch-to-talk and touch-to-mute. It is designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations. The microphone switch can control or be controlled by external automatic central control system or other devices.