A device for monitoring an operating condition of a machine is disclosed. The device includes a sound detection device located in proximity to the machine and configured to collect a plurality of sound signals in real-time from the machine. The device also includes a processor electrically coupled to the sound detection device. The processor is configured to acquire one or more predefined sound analytics models associated with the machine. The processor is also configured to analyse the plurality of sound signals based on the one or more predefined sound analytics models. The processor is further configured to identify the operating condition of the machine based on an analysed result and the one or more predefined sound analytics models. The device also includes a sound analytics system which is further configured to update the one or more predefined sound analytics models based on the plurality of sound signals.