Electro-Voice RE-97 2 TX Dual Earpiece Miniature Headworn Microphone - Brown is an ultra-low profile, omnidirectional, back-electret condenser headworn microphone designed for use with standard EV and Telex belt packs
It can also be used with Audio-Technica systems. The Electro-Voice RE-97 2 TX Dual Earpiece Miniature Headworn Microphone - Black is intended for spoken word use such as Churches, Corporate AV, Theatre, Fixed Install, and other venues where a full-range, natural, well balanced sound is required.

Generating Element: Condenser back electret Frequency Response: 50 – 15kHz Polar Pattern: Omnidirectional Sensitivity 1kHz(Open Circuit):4.0mV / Pascal Clipping Level: >125 dB SPL Equivalent Noise: 32 dBA Dynamic Range: 93 dB Output Impedance1kHz:3000 ohms Power Requirements: 5 VDC Current Consumption: 310 uA Polarity: Positive pressure on diaphram produces a positive voltage on pin 2. Dimensions: Boom length (as shipped): 3.4 in.(86.4 mm); Boom diameter: 0.080 in. (2.00 mm); Capsule diameter: 0.120 in. (3.05mm); Earhook diameter: 0.090 in. (2.30 mm) Cable: 4 ft (1.22m) long 0.077 in. (1.95mm)diameter Connector Wiring: Pin #1 – Ground Shield; Pin #2 – Audio; Pin #3 – Bias Voltage; Pin #4 – N/C Accessories Furnished: Windscreen Clothing Clip Gig Bag Color: Black Net Weight: 0.6 oz. (17g); Mic only: 0.2 oz. (5.7g)