The Audio Technica U891Rx is a wide-range condenser microphone with a cardioid polar pattern. It is designed for surface-mount applications such as high-quality sound reinforcement, conferencing, professional recording, and other demanding sound pickup applications.

The Audio Technica U891Rx boundary microphone features an activation switch that can be set (via a
switch on the bottom of the microphone) to any of three operating modes: “press-on/press-off,” “press-to-talk” and “press-to-mute”.

The microphone is equipped with UniGuard(r) RFI-shielding technology, which offers outstanding rejection of radio frequency interference (RFI).