The ATUC-50DU has a 3-pin XLRF-type input for use with ATUC-M43H or ATUC-M58H microphones. Includes a talk/request-to-talk button, channel/volume display, channel selection buttons, built-in speaker, 3.5 mm (1/8") headphone jack with volume control, two LED indicators, and two RJ45 ports. Designed for tabletop or recessed mounting.