Addressable siren powered by loop, for indoor use, consisting of 2 supervised physical/logical units: 2 controlled outputs, uniquely identified by the system, maximum occupation 2 addresses, to control 2 different signalling tones. 64 programmable tones, maximum acoustic pressure 101db/1mt. Optional optical signalling activable from programming. RSC functions, Fire-Speed protocol. Loop isolator with dual insulator. Transparent cover, red Leds. EN 54.3-17 certified.