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Black metal box. On the front left is a discrete plastic lever and next to it a function switch and three rotary volume, mode (automatic, semi-automatic, on hold) and speed controls. It was used during the training of Morse telegraph operators. Japanese-made Dentsu Seiki automatic electronic telegraph transmitter, type DA-1. This transmitter can operate fully automatically, semi-automatically or end operations via a special key. Its operation system was based on alternating current AC 220 V or direct current DC 120. The speed of signal transmission ranged between 350-800 dots or 165-330 dashes. The speed can be regulated at any time. Since the mid-1960s, the device encapsulated the technological advancements in telecommunications, and especially in telegraph services, at the level of production and materials as well as of automation and operation. It was used on boats but also for the training of operators.