Variable Polar Pattern / Boundary Series:220VPW The variable polar pattern boundary series 220VPW is a hidden, continuously-variable complete design, button-style, condenser boundary microphone designed for exterior installing. Special attention has been given to design the 220VPW to fight disturbance from mobile phone gadgets, two-way interaction, and other RF gadgets. The important 80Hz, 12dB/octave high-pass filter eliminates undesirable low-frequency energy to increase intelligibility. The all steel, threaded body and shock-absorbing bushings make for easy installing in materials up to 3" wide. When installed on a hard exterior, the 220VPW will take benefits of the boundary effect signal-to-noise rate increase. The 220VPW is finished with a conventional 3-pin XLRM-type connection recessed in our body of the microphone. Specifications: Operating Principle: Condenser Polar Pattern: Continuously-variable Frequency Response: 90Hz -17KHz Sensitivity: -32dBV (25mV) @ 1 Pa Impedance: 120 ohms Maximum SPL: 120dB, 1% T.H.D., 1KHz Self Noise: 18dBA Power Requirements: P12, P24, P48, 4mA Connector: 3-pin XLRM-type Polarity: Positive pressure on diaphragm corresponds to positive voltage on pin 2 relative to pin 3 at XLR3M-type connector. Finish: Durable matte-black urethane or white (220VPW) Net Weight [Mass]: 3.9oz [0.11Kg] Packaged Weight [Mass]: 5.0oz [0.14Kg] RF Immunity: Meets or exceeds EN55103-2,E1, E2, E3 and E4