Check the listing for details. Shure MX393/C Microflex Cardioid Boundary Microphone. Condition: Used. Listed at 99.99 USD. This black Shure MX393/C Microflex is a cardioid boundary microphone designed to capture high-quality speech and voice for sound-reinforcement and teleconferencing installations in governmental, institutional, religious, and business settings.The MX393/C can be permanently installed on conference tables, desks, or lecterns. Its sleek, low-profile design is ideal for conference rooms and other sites where minimal mic visibility is of high priority and aesthetics are important.The microphone features a cardioid polar pattern best used for a single person or two people sitting side by side. The mic takes advantage of the boundary effect to capture clear speech with reduced room ambience for intelligibility. The interchangeable capsule design provides the installer with greater flexibility and makes it possible to easily reconfigure microphone coverage as the need arises.The MX393/C is equipped with a programmable, silent membrane switch with a bicolor LED that indicates the status of the mic.The mic resists interference from devices such as cell phones and two-way communication devices. It requires 11 to 52V phantom power to operate. Included is an easy-to-use paint mask for custom-color installations.Key FeaturesSleek, low-profile design for surface mountingCardioid polar pattern and flat frequency response across the vocal range for natural soundProgrammable mute button with Push-to-Talk, Push-to-Mute, or Push-On/Push-Off modes and bicolor LED indicator12' attached cable with XLR connector and back cable exitInterchangeable capsule designRF filteringPaint mask for your custom-color installations Shure MX393 SpecsMicrophoneForm FactorBoundary/Surface MountSound FieldMonoCapsuleElectret CondenserPolar PatternCardioidHigh-Pass FilterNoneIndicators1 x Red/Green Single LED (Status)On-Board ControlsMic Mute, Push-to-Talk, On/OffPerformanceFrequency Range50 Hz to 17 kHzMaximum SPL117 dB SPL (1 kHz, 1% THD, 1-Kilohm Load)Off-Axis Rejection45 dBImpedance180 OhmsSensitivity-27.5 dBV/Pa at 1 kHz (Open Circuit Voltage, 1 kHz)Dynamic Range94 dBSignal-to-Noise Ratio71 dB (at 1 Pa/94 dB SPL)Equivalent Noise Level23 dB A-WeightedTHD1%ConnectivityOutput Connectors (Analog)1 x XLR 3-Pin Male (on Attached Cable)Cable Length12' / 3.66 mPowerOperating Voltage11 to 52 VOperating Current Consumption2 mAPhysicalColorBlackMountingSurface-MountOperating Temperature0 to 135°F / -17.78 to 57.22°COperating Humidity0 to 95%Storage Temperature-20 to 165°F / -28 to 74°CDimensionsW: 3 x L: 4.26" / W: 76.2 x L: 108.3 mmWeight0.38 lb / 172 g