A device for signalling audible alarms or other specific acoustic signals associated to a respective sound source, which comprises: • a plurality of receiving and transmitting elements, wherein each one thereof can be associated to a specific acoustic alarm, by means of an appropriate phase for recording and recognizing the sound and associating to an identifying code, near the emitting sound source thereof, each receiving and transmitting element comprising: ∘ a piezoelectric sensor for receiving the acoustic alarm; ∘ a microprocessor provided with at least a storage device, implementing the recognition of the acoustic alarm by means of a FFT analysis; and ∘ means for the radiofrequency transmission of a signal thereto the code identifying the receiving and transmitting element is associated, • a portable terminal, apt to receive and recognize the signals emitted by the receiving and transmitting elements, having: ∘ a radiofrequency antenna: ∘ a processor associated to a storage device including a library of codes identifying receiving and transmitting elements, ∘ means for the wireless connection to a portable processing device, such as a smartphone and the like, for programming said processor; and ∘ means for the visual and/or vibration signalling, • a software, installed on a portable processing device such as smartphone and the like, capable of connecting to said means for the wireless connection and to provide an interface for programming said terminal, wherein each receiving and transmitting element is shaped like a plate acting as transducer for the mechanical vibrations associated to the above-mentioned acoustic alarm, and it comprises means for fastening to a surface. • a plurality of receiving and transmitting elements, wherein each one thereof can be associated to a specific acoustic alarm, by means of an appropriate phase for recording and recognizing the sound and associating to an identifying code, near the emitting sound source thereof, each receiving and transmitting element comprising: ∘ a piezoelectric sensor for receiving the acoustic alarm; ∘ a microprocessor provided with at least a storage device, implementing the recognition of the acoustic alarm by means of a FFT analysis; and ∘ means for the radiofrequency transmission of a signal thereto the code identifying the receiving and transmitting element is associated, ∘ a piezoelectric sensor for receiving the acoustic alarm; ∘ a microprocessor provided with at least a storage device, implementing the recognition of the acoustic alarm by means of a FFT analysis; and ∘ means for the radiofrequency transmission of a signal thereto the code identifying the receiving and transmitting element is associated, • a portable terminal, apt to receive and recognize the signals emitted by the receiving and transmitting elements, having: ∘ a radiofrequency antenna: ∘ a processor associated to a storage device including a library of codes identifying receiving and transmitting elements, ∘ means for the wireless connection to a portable processing device, such as a smartphone and the like, for programming said processor; and ∘ means for the visual and/or vibration signalling, ∘ a processor associated to a storage device including a library of codes identifying receiving and transmitting elements, ∘ means for the wireless connection to a portable processing device, such as a smartphone and the like, for programming said processor; and ∘ means for the visual and/or vibration signalling, • a software, installed on a portable processing device such as smartphone and the like, capable of connecting to said means for the wireless connection and to provide an interface for programming said terminal,