Adopting full-duplex voice intercom communication technology, automatic recognition and processing of voice signals, no operation required during the call. Suitable for banks/securities/hospitals/station.Applying automatic call control technology, integrated design between the external microphone and speaker, realize one-line connection with the host. It is easy to install. Special sidetone processing chip with automatic squelch function, can effectively improve whistle.Comprehensive application of electroacoustic technology experience, selection of electro-acoustic device design with excellent performance, up to 3W output power, clear and loud sound, and high speech resolution.The host is designed with independent internal and external mute switches, can easily control them to meet our needs. Can output two internal and external sound signals (with bank teller recording). With the stereo jack output mode, the recording function is not controlled by the power switch and each function button.