The MP 300 speak-through system has been expressly designed for assisting conversation between personnel and customers separated by a glass security window which prevents sound transmission. With the MP 300, conversation is carried out naturally, without the need for pushing buttons or using telephone units. A number of special functions, such as direct or switched mode selection and the "forced volume" function, make it possible to adapt the system to various environments and noise levels. The system is composed of the MP 341 amplification and control unit, the MP 321 operator microphone, the MP 302 user microphone, and the MP 301 speakers
