"Built-in ceiling loudspeaker of 6 W in 100 V line and sockets for 6, 3, 1.5 and 0.5 W, certified EN 54-24 and Bureau Veritas ""Marine & Offshore"". With ceramic terminals, back box and metal grille, IP32c degree of protection and quick assembly using hooks. In addition to the usual uses of ceiling loudspeakers in all types of installations, their certificates allow the use of this model in public address and voice alarm systems that must comply with the EN 54 standard, as well as in boats and floating structures."