The versatile U891RW cardioid condenser boundary microphone from Audio-Technica features a touch-sensitive on-off switch that can be set to three modes: press-on/press-off, press to talk, and press to mute. The phantom-powered boundary microphone is equipped with an innovative PivotPoint rotating output connector and an LED status indicator. UniGuard innovations offer unsurpassed immunity from radio frequency interference, and an 80 Hz low-cut UniSteep filter reduces pickup of low-frequency ambient noise. A heavy die-cast case and silicon foam bottom pads minimize coupling of surface vibration to the microphone. The plate mic's self-contained electronics eliminate the need for an external power module.