Explosion-proof telephone is used in power plant, chemical plant and other inflammable and explosive places, with couplers, also known as the coupler explosion-proof telephone. It is the terminal equipment of explosion-proof communication system and has the basic functions of ordinary telephone sets. The EXPLOSION-PROOF TELEPHONE CAN BE DIRECTLY connected TO THE 24~60 VOLT AUTOMATIC telephone exchange OF the MUNICIPAL telephone network and the user's small exchange (or dispatch machine).