The RE90P-18 is apodium microphone are phantom-powered ?backelectret? miniature condenser gooseneck microphone. The back-electret feature provides greater sensitivity, wider frequency response, and superior immunity from handling noise than a diaphragm-electret microphone. The RE90P-18is mechanically designed for quick, easy mounting to a lectern, pulpit or podium equipped with a bulkhead female XLR-type 3-pin receptacle. For permanent installation, optional fixed (FMK flange-mount kit) and shock-mounted (CPSM shock-mount kit) accessories are also available. Specifications: Generating Element: Condenser, back electret. Frequency Response: 100Hz-15kHz. Polar Pattern: Cardioid. Sensitivity, Open Circuit Voltage: 4.5 mV/pascal @ 1 kHz. Power Level: -43dB at 1,000 Hz (0 dB = 1 mW/pascal). Dynamic Range: 102 dB. Equivalent Output Noise: <28 dB SPL ?A? weighted (0 dB=20 micropascals). Impedance: measured at 1,000 Hz (works with all low-Z mic inputs). Power Requirements: 9-52 V dc phantom supply. Current Consumption: 2.5 mA. Polarity: A positive pressure on the diaphram produces a positive voltage on output pin 2(+). Color: Nonreflecting black. Net Weight: 6.4 oz. Mounting: Male XLR-type 3-pin connector. Dimensions: Gooseneck and Head Length: 11.05 in., Maximum Head Diameter: 0.5 in., Gooseneck Diameter: 0.25 in., Electronics Module Diameter: 0.79 in., Connector Diameter: 0.75 in. Accessories Furnished: Windscreen, Double-sided tape