The Astatic 1800VP Variable Pattern Podium Microphone features an 18" flexible gooseneck microphone and power supply with continuously variable polar pattern dial. In addition, an 80Hz / 12dB high Pass filter switch minimizes low-frequency noise. Both the microphone and control box are impervious to RFI (Radio Frequency Interference) from cell-phones, PDAs, Blue-Tooth and other devices. The 1800VP delivers transparent speech reproduction in any public-address application. Continuously-variable polar pattern controllable from a remote location Remote box is rack mountable up to six units per shelf Blue LED status indicator on remote box Selectable recessed high-pass filter for elimination of unwanted low-frequency energy Securable controls with standard flat style blank rack panel, when rack mounted RF (radio frequency) Resistant Architecture Included 18" gooseneck with XLRM-type quick connector Engineered and built in the U.S.A. Microphone Capsule Condenser Pattern Selection Continuously Variable High-Pass Filter 80 Hz, 12 dB/Octave Performance Frequency Range 40 Hz to 20 kHz Maximum SPL 110 dB SPL (1 kHz, 1% THD) Impedance 135 Ohms Signal-to-Noise Ratio 22 dB A-Weighted Connectivity Output Connectors (Analog) 1 x XLR 3-Pin Power Operating Voltage 12 to 48 V Operating Current Consumption 4 mA Packaging Info Package Weight 2.295 lb Box Dimensions (LxWxH) 17.6 x 10.4 x 4.4"