The phantom-powered U851RW UniPoint Cardioid Condenser Boundary Microphone features a PivotPoint rotating output connector, UniSteep filter and UniGuard RFI-shielding technology. Offering outstanding speech intelligibility and transparent sound quality for surface-mount applications, the U851RW boundary mic accepts interchangeable condenser elements--available for boundary microphones in cardioid, hypercardioid and omnidirectional polar patterns. With a heavy die-cast case and silicon foam bottom pads to minimize coupling of surface vibration to the microphone, the Audio Technica U851RW is equipped with self-contained electronics, eliminating the need for an external power module.