MSA's Ultra Elite XT Communication System is designed specifically to meet firefighters' communication needs. The Ultra Elite XT Communication System is available in two configurations 1) amplifier or 2) amplifier with radio interface, allowing firefighting teams the right tool for the job at hand. Innovative design helps to reduce expenses via the system's shared-use amplifier, reducing the need for individual issue equipment. Ultra Elite XT Communication Systems feature an internally mounted microphone coupled with a large diameter (2 in) amplifier speaker producing optimal voice clarity and volume. Integrating a patented circuit design, the system delivers STI scores (Speech Transmission Index) that exceed NFPA 1981_2013 Edition Standard requirement minimum. Profile mounted on an MSA Ultra Elite Facepiece, the system does not block vision or impede the facepiece's fully functional mechanical voice communications. Radio interface version features the same high performance amplifier as the amplifier-only version, combined with an earspeaker for incoming radio messages; push-to-talk (P-T-T) or lapel microphone assembly interface with more than 100 radio models. P-T-T features a front-mounted button for ease of use inside of HazMat suits; lapel microphone functions as stand-alone communication component without a facepiece.