The Shure MX393/O is an omnidirectional condenser boundary microphone with a built-in preamp, a removable 12 ft (4 m) that terminates to a balanced XLR-3M type connector cable. Logic Functions and programmable switch with LED indicator are also standard. This microphone operates on phantom power only. Includes: Shure MX393/O Omnidirectional Condenser Boundary Microphone - 12' XLR Cable - Shure Warranty Features: Flat frequency response across the vocal range for uncolored sound Sleek, low-profile design for unobtrusive appearance Balanced, transformerless output for increased immunity to noise over long cable runs Programmable membrane on/off switch plus LED on/off indicator Specifications: Transducer: Condenser Frequency Response: 50 to 17,000 Hz Polar Pattern: Omnidirectional Output Impedance: EIA Rated at 150 ohms (180 ohms actual) Sensitivity: -22.0 dBV/Pa (79.4 mV) (at 1 kHz, open circuit voltage) Maximum Sound Pressure Level: 111.5 dB (1 kHz at 1% Total Harmonic Distortion, 1 k ohm load) Signal to Noise Ratio: 76.5 dB (referenced at 94 dB SPL) Equivalent Output Noise (A-weighted): 17.5 dB SPL Dynamic Range: 94.0 dB Common Mode Rejection: 45 dB minimum, 10 Hz to 100 kHz Switch Attenuation: 50 dB minimum Preamplifier Output Clipping Level: -6 dBV (0.5 V) Polarity: Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of output connector Power Requirements: 11 to 52 Vdc phantom 2.0 mA current consumption Environmental Requirements: Operating Temperature Range: -18 to 57 degrees C (0 to 135 degrees F) Relative Humidity: 0 to 95% Dimensions (L x W x H): 4.263 x 3 x 1.621 (108.3 x 76.3 x 41.2 mm) Weight: 4.16 oz. (117.9 g)