The UTX-M03 is a Hand-held microphone operates from two AA batteries (alkaline, nickel metal hydride, or lithium batteries). This microphone features a robust, metallic body. It has a muting function and attenuator adjustment function to support a wide audio input level range. It can be used in diverse applications simply by changing the microphone capsule. It has a built-in antenna. Microphone unit mounting dimensions: 31.3mm diameter, 1.0mm pitch