351000 Basic Speaker Porter Module 2 Wires Sfera New

BTICINO 351000 SFERA New Robur 2-wire basic speaker module for making 2-wire door phone systemsEquipped with loudspeaker and microphone volume adjustmentsManages up to a maximum of 100 push-button calls, using additional double-row push-button modulesAllows the opening of an electric lock connected directly to terminals S+ and S- (18 V 4 A impulsive - 250 mA holding at 30 ohm max) and the connection of a local lock release button on the PL terminals