1. Widely used in oil exploration, oil refining, chemical, military and other hazardous environments and offshore oil platforms, oil tankers and other dangerous places for the accident signal alarm or as a signal indication;
2. Suitable for explosive gas environment zone 1, zone 2;
3. Explosive atmosphere: class ⅡA,ⅡB, ⅡC;
4. Suitable for combustible dust environment in the area 22, 21;
5. Suitable for high protection requirements, damp places.