- Performing stable movement at vessel or large-scale plant where exists severe vibration and strong impact by adopting a special structure of striking solenoid bell
- Transmitting plain and light alarm sound by adopting a bell housing made of material efficient for sound transmission
- Suitable for the places where always exists salt like vessel and shipbuilding yard, and such places as steel plant and outdoor crane where is inferior in their environment 
- Material: body die-cast Al, bell-steel
- Frequency: 400-600Hz
- Bell volume: maximum 95dB/m
- Protection class: Exd IIC T6, IP56