The Beta 181/BI has a bidirectional (figure-8) pickup pattern, making it perfect for advanced mic placement techniques such as Mid-Side stereo, while adding extraordinary off-axis sound rejection to its easy of positioning. What's even better is that, like all Beta 181 models, the Beta 181/BI has a switchable capsule, so you can pick up additional polar patterns to suite your needs. Shure Beta 181/BI Small-diaphragm Side-address Condenser Microphone Features at a Glance: Polar pattern: Bidirectional (figure-8) Sensitivity: -51.0dBV/Pa (2.6 mV) Maximum SPL: 156.0dB SPL (2.5-kohm load), 153.5dB SPL (1-kohm load) Precision-engineered, compact side-address design Easy to position in many configurations and in tight places front-address condensers won't fit Optional interchangeable polar pattern capsules attach to the Beta 181 body for extra flexibility For use in high SPL environments Includes stand adapter, windscreen, and carrying case (carrying case will securely protect up to 4 polar pattern capsules) Weight: 5.1 oz. Requires +48V phantom power The Sure Beta 181 small-diaphragm side-address condenser microphone adds flexibility to any studio Figure 8 Compact SideAddress Instrument Microphone from Shure is 100% original and is available at Edge Electronics. Speak to our expert for booking a live demonstration. After sales customer service is an integral part of our business ethic and is taken very seriously.