... 15W Explosion proof Speaker Feature: The aluminum speaker is used for hazardous locations with explosive atmosphere micture, zone 0, 1,2 ... oil, chemical industry, fire power plants etc to deliver hazard alarm. Explosion proof Speaker AS-0120 Specification: Explosion proof grade:Ⅰstep ... (1W/1m) ,120dB(20W/1m)Size150x115x100mmWeight:2KG 16W Explosion Proof/anti-explosion Speaker for hazardous locations