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!

Tech Specs
Microphone Type Condenser
Polar Pattern Figure-8
Frequency Response 20Hz-20kHz
Max SPL 151dB
Output Impedance 110 ohms
Connector XLR
Manufacturer Part Number BETA 181/BI

Warranty: 2 years.