Headset cardioid condenser microphone that is same as the Audio-Technica ATM75a model, but features a less power module. It still offers a pivot-mounted flexible mic boom that descends from either the left or right side, delivering professional-quality vocal pickup with hands-free operation. It also features a low-visibility headband that provides stable, comfortable fit, and a belt-mounted power module which operates on either battery or phantom power. The microphone has a cardioid polar pattern that improves isolation of desired sound source, an integral 3-pin XLRM-type output connector (power module) and a 2.2m long, two-conductor shielded cable that is permanently attached to microphone and terminated with locking 4-pin connector for A-T UniPak wireless systems. It comes supplied with a less power module, the AT8439 clothing clip, the AT8139L large windscreen and the AT8139S small windscreen, and a single AA battery for power module operation. Frequency response: 100 Hz-13 kHz. Low frequency roll-off: 80 Hz, 18 dB/octave. Open circuit sensitivity: -51 dB (2.8 mV) (phantom), -53 dB (2.2 mV) (battery). Impedance: 200 ohms (phantom), 270 ohms (battery). Maximum input sound level: 132 dB (phantom), 121 dB (battery). Dynamic range: 96 dB (phantom), 85 dB (battery). Signal-to-noise ratio: 58 dB. Phantom power requirements: 11-52 V DC. Dimensions: 20.4 mm diameter (microphone), 120 x 80.5 mm (headset), 84 x 63 x 22 mm (power module). Weight: 60 g (microphone), 139 g (power module).