... of engineering plastic with properties of impact-withstanding and corrosion-proof.2. high efficient reflecting bowl.3. the transparent window is ... . inner-lying switch, with the functions of good water-proof and dust-proof.6. use special tools when maintaining, so that it ... for GB3836-2000, IEC60079, GB12476.1-2000,IEC01241 standard request. Explosion-proof, Flash lights