Provides crisp, full-sounding voice pickup and it's effective for acoustic guitars and horns too.

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Audio-Technica AT831R Cardioid Condenser Lavalier Microphone Features:

Clip-on lavalier mic also excels in acoustic guitar applications
Provides crisp, full-sounding voice and instrument pickup
Excellent gain before feedback and suppression of background noise
Operates on phantom power only
25' (7.6 m) cable permanently attached to mic, TA3F connector at power module

Audio-Technica AT831R Cardioid Condenser Lavalier Microphone Specifications:

Element: Fixed-charge back plate, permanently polarized condenser
Polar pattern: Cardioid
Frequency response: 40-16,000 Hz
Low frequency roll-off: 80 Hz, 18 dB/octave
Open circuit sensitivity: 42 dB (12.5 mV) re 1V at 1 Pa
Impedance: 250 ohms
Maximum input sound level: 141 dB SPL, 1 kHz at 1% T.H.D.
Dynamic range (typical): 112 dB, 1 kHz at Max SPL
Signal-to-noise ratio: 65 db, 1 kHz at 1 Pa
Phantom power requirements: 11-52V DC, 2 mA typical
Switch: Flat-roll-off
Weight (microphone): .01 oz. (2.8 g)
Weight (power module): 2.9 oz. (81 g)
Dimensions (microphone): 0.98" (24.8 mm) long, 0.40" (10.2 mm) diameter
Dimensions (power module): 3.66" (92.9 mm) long, .74" (18.9 mm) diameter
Output connector (power module): Integral 3-pin XLRM-type
Cable: 25.0' (7.6 m) long (permanently attached to microphone), 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F-type connector
Accessories furnished: AT8417 clothing clip; AT8418 UniMount microphone instrument mount; AT8444 guitar adapter; AT8538 remote power module; AT8116 windscreen; protective carrying case
Audio-Technica case style: M1