Offering outstanding Audio-Technica sound for surface-mount applications, the U851A features a PivotPoint rotating output connector, UniSteep filter and UniGuard RFI-shielding technology. This battery- or phantom-powered condenser microphone accepts interchangeable condenser elements—available for boundary microphones in cardioid, hypercardioid and omnidirectional polar patterns. Its heavy die-cast case and silicon foam bottom pads minimize coupling of surface vibration to the microphone. With superior off-axis rejection and maximum gain-before-feedback, this professional microphone sets audio-quality standards in challenging acoustic environments. Features: Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations PivotPoint rotating output connector allows cable to exit from either the rear or the bottom of the microphone Superior off-axis rejection for maximum gain before feedback UniGuard RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI) UniSteep filter provides a steep low-frequency attenuation to improve sound pickup without affecting voice quality Small-diameter UniPoint capsule near boundary eliminates phase distortion and delivers clear, high-output performance Heavy die-cast case and non-slip silicone foam bottom pads minimize coupling of surface vibration to the microphone Low-profile design with low-reflectance black finish for minimum visibility Operates on battery or phantom power Specifications: Element: Fixed-charge back plate, permanently polarized condenser Polar Pattern: Half-cardioid (cardioid in hemisphere above mounting surface) Frequency Response: 30-20,000 Hz Low Frequency Roll-Off: 80 Hz, 18 dB/octave Open Circuit Sensitivity: Phantom: -40 dB (10.0 mV) re 1V at 1 Pa Battery: -41 dB (8.9 mV) re 1V at 1 Pa Impedance: Phantom: 200 ohms, Battery: 270 ohms Maximum Input Sound Level: Phantom: 133 dB SPL, 1 kHz at 1% T.H.D. Battery: 123 dB SPL, 1 kHz at 1% T.H.D. Dynamic Range (typical): Phantom: 111 dB,1 kHz at Max SPL Battery: 101 dB, 1 kHz at Max SPL Signal-to-Noise Ratio: 72 dB, 1 kHz at 1 Pa Phantom Power Requirement: 11-52V DC, 2 mA typical Output Connector: Integral 3-pin XLRM-type Battery Type: 1.5V AA/UM3 Battery Current / Life: 0.4 mA / 1200 hours typical (alkaline) Switch: Off, on-flat, on-roll-off Cable Length: 25.0' / 7.6m (permanently attached to microphone), 0.13" / 3.2mm (Diameter), 2-conductor, shielded cable with TA3F-type connector Dimensions: Microphone: 4.25x3.31x0.91" / 10.79x8.40x2.31cm, Power Module: 3.31x2.48x0.87" / 8.40x6.29x2.20cm Weight: Microphone: 8.6oz / 243.80g, Power Module: 4.9oz / 138.91g