Monofon, Evolution volume control, 2.5mm

High-performance omni-directional speaker microphone, adjustable high/low volume control, built-in debris screen, sealed housing meets MIL-STD-810. Includes a 2.5mm unthreaded receive-only jack on the bottom of the microphone eliminating the need for long wires. When a earpiece is plugged-in it will mute the speaker for discreet communications.