Two-way connection. Up to 6 personal and conference calls. Work in extremely noisy environments ≈ 90dB background. Callable call up to 50m from the station. Understanding speech up to 20 meters from the base station. Autonomy of zonal stations. Lack of microphone. Opportunity to work with headphones.Elementary to work.No requires constant maintenance and settings. Guaranteed long lifetime of 24 hours.